57521638 has 16 divisors (see below), whose sum is σ = 87989760. Its totient is φ = 28197000.

The previous prime is 57521617. The next prime is 57521671. The reversal of 57521638 is 83612575.

It is a junction number, because it is equal to n+sod(n) for n = 57521597 and 57521606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22653 + ... + 25063.

It is an arithmetic number, because the mean of its divisors is an integer number (5499360).

Almost surely, 2^57521638 is an apocalyptic number.

57521638 is a deficient number, since it is larger than the sum of its proper divisors (30468122).

57521638 is a wasteful number, since it uses less digits than its factorization.

57521638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2643.

The product of its digits is 50400, while the sum is 37.

The square root of 57521638 is about 7584.3020773173. The cubic root of 57521638 is about 386.0205408454.

The spelling of 57521638 in words is "fifty-seven million, five hundred twenty-one thousand, six hundred thirty-eight".