56521642 has 4 divisors (see below), whose sum is σ = 84782466. Its totient is φ = 28260820.

The previous prime is 56521631. The next prime is 56521687. The reversal of 56521642 is 24612565.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 55219761 + 1301881 = 7431^2 + 1141^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14130409 + ... + 14130412.

Almost surely, 2^56521642 is an apocalyptic number.

56521642 is a deficient number, since it is larger than the sum of its proper divisors (28260824).

56521642 is a wasteful number, since it uses less digits than its factorization.

56521642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28260823.

The product of its digits is 14400, while the sum is 31.

The square root of 56521642 is about 7518.0876557806. The cubic root of 56521642 is about 383.7705017924.

The spelling of 56521642 in words is "fifty-six million, five hundred twenty-one thousand, six hundred forty-two".