745221330 has 256 divisors, whose sum is σ = 2380492800. Its totient is φ = 162362880.

The previous prime is 745221319. The next prime is 745221341. The reversal of 745221330 is 33122547.

745221330 is a `hidden beast` number, since 7 + 4 + 522 + 133 + 0 = 666.

745221330 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (745221319) and next prime (745221341).

It is a super-3 number, since 3×745221330³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 745221294 and 745221303.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 4571829 + ... + 4571991.

It is an arithmetic number, because the mean of its divisors is an integer number (9298800).

Almost surely, 2^745221330 is an apocalyptic number.

745221330 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 745221330, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1190246400).

745221330 is an abundant number, since it is smaller than the sum of its proper divisors (1635271470).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

745221330 is a wasteful number, since it uses less digits than its factorization.

745221330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286 (or 280 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 745221330 is about 27298.7422787205. The cubic root of 745221330 is about 906.6265347421.

Adding to 745221330 its reverse (33122547), we get a palindrome (778343877).

It can be divided in two parts, 7452 and 21330, that added together give a palindrome (28782).

The spelling of 745221330 in words is "seven hundred forty-five million, two hundred twenty-one thousand, three hundred thirty".