745780 has 36 divisors (see below), whose sum is σ = 1824228. Its totient is φ = 255360.

The previous prime is 745757. The next prime is 745817. The reversal of 745780 is 87547.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 86436 + 659344 = 294^2 + 812^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 600 + ... + 1360.

It is an arithmetic number, because the mean of its divisors is an integer number (50673).

2⁷⁴⁵⁷⁸⁰ is an apocalyptic number.

745780 is a gapful number since it is divisible by the number (70) 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 745780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (912114).

745780 is an abundant number, since it is smaller than the sum of its proper divisors (1078448).

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

745780 is a wasteful number, since it uses less digits than its factorization.

745780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784 (or 775 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 31.

The square root of 745780 is about 863.5855487443. The cubic root of 745780 is about 90.6853035026.

The spelling of 745780 in words is "seven hundred forty-five thousand, seven hundred eighty".