56721072 has 40 divisors (see below), whose sum is σ = 151260160. Its totient is φ = 18296640.

The previous prime is 56721047. The next prime is 56721109. The reversal of 56721072 is 27012765.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17572 + ... + 20547.

It is an arithmetic number, because the mean of its divisors is an integer number (3781504).

Almost surely, 2^56721072 is an apocalyptic number.

It is an amenable number.

56721072 is an abundant number, since it is smaller than the sum of its proper divisors (94539088).

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

56721072 is a wasteful number, since it uses less digits than its factorization.

56721072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38161 (or 38155 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 56721072 is about 7531.3393231218. The cubic root of 56721072 is about 384.2213350730.

The spelling of 56721072 in words is "fifty-six million, seven hundred twenty-one thousand, seventy-two".