720856392 has 128 divisors (see below), whose sum is σ = 1924715520. Its totient is φ = 224640000.

The previous prime is 720856387. The next prime is 720856439. The reversal of 720856392 is 293658027.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3982542 + ... + 3982722.

It is an arithmetic number, because the mean of its divisors is an integer number (15036840).

Almost surely, 2^720856392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720856392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (962357760).

720856392 is an abundant number, since it is smaller than the sum of its proper divisors (1203859128).

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

720856392 is a wasteful number, since it uses less digits than its factorization.

720856392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 371 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 720856392 is about 26848.7689103244. The cubic root of 720856392 is about 896.6361639930.

The spelling of 720856392 in words is "seven hundred twenty million, eight hundred fifty-six thousand, three hundred ninety-two".