621049440 has 432 divisors, whose sum is σ = 2345985936. Its totient is φ = 137871360.

The previous prime is 621049439. The next prime is 621049441. The reversal of 621049440 is 44940126.

It is an interprime number because it is at equal distance from previous prime (621049439) and next prime (621049441).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 621049398 and 621049407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621049441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 16785102 + ... + 16785138.

It is an arithmetic number, because the mean of its divisors is an integer number (5430523).

Almost surely, 2^621049440 is an apocalyptic number.

621049440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621049440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1172992968).

621049440 is an abundant number, since it is smaller than the sum of its proper divisors (1724936496).

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

621049440 is a wasteful number, since it uses less digits than its factorization.

621049440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 621049440 is about 24920.8635484407. The cubic root of 621049440 is about 853.1827343826.

Adding to 621049440 its reverse (44940126), we get a palindrome (665989566).

The spelling of 621049440 in words is "six hundred twenty-one million, forty-nine thousand, four hundred forty".