721534056 has 32 divisors (see below), whose sum is σ = 1813812000. Its totient is φ = 239181120.

The previous prime is 721534019. The next prime is 721534061. The reversal of 721534056 is 650435127.

It is a super-2 number, since 2×721534056² = 1041222787935622272, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78706 + ... + 87393.

It is an arithmetic number, because the mean of its divisors is an integer number (56681625).

Almost surely, 2^721534056 is an apocalyptic number.

It is an amenable number.

721534056 is an abundant number, since it is smaller than the sum of its proper divisors (1092277944).

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

721534056 is a wasteful number, since it uses less digits than its factorization.

721534056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166289 (or 166285 counting only the distinct ones).

The product of its (nonzero) digits is 25200, while the sum is 33.

The square root of 721534056 is about 26861.3859657316. The cubic root of 721534056 is about 896.9170464507.

The spelling of 721534056 in words is "seven hundred twenty-one million, five hundred thirty-four thousand, fifty-six".