56721632 has 24 divisors (see below), whose sum is σ = 121823352. Its totient is φ = 25782400.

The previous prime is 56721589. The next prime is 56721647. The reversal of 56721632 is 23612765.

It is a Harshad number since it is a multiple of its sum of digits (32).

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 3 ways as a sum of consecutive naturals, for example, 80219 + ... + 80922.

It is an arithmetic number, because the mean of its divisors is an integer number (5075973).

Almost surely, 2^56721632 is an apocalyptic number.

It is an amenable number.

56721632 is an abundant number, since it is smaller than the sum of its proper divisors (65101720).

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

56721632 is a wasteful number, since it uses less digits than its factorization.

56721632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161162 (or 161154 counting only the distinct ones).

The product of its digits is 15120, while the sum is 32.

The square root of 56721632 is about 7531.3765010123. The cubic root of 56721632 is about 384.2225995251. Note that the first 3 decimals are identical.

The spelling of 56721632 in words is "fifty-six million, seven hundred twenty-one thousand, six hundred thirty-two".