57642639 has 4 divisors (see below), whose sum is σ = 76856856. Its totient is φ = 38428424.

The previous prime is 57642617. The next prime is 57642643. The reversal of 57642639 is 93624675.

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

It is a cyclic number.

It is not a de Polignac number, because 57642639 - 2⁸ = 57642383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57642639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57602639) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 9607104 + ... + 9607109.

It is an arithmetic number, because the mean of its divisors is an integer number (19214214).

Almost surely, 2^57642639 is an apocalyptic number.

57642639 is a deficient number, since it is larger than the sum of its proper divisors (19214217).

57642639 is a wasteful number, since it uses less digits than its factorization.

57642639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19214216.

The product of its digits is 272160, while the sum is 42.

The square root of 57642639 is about 7592.2749555058. The cubic root of 57642639 is about 386.2910254807.

The spelling of 57642639 in words is "fifty-seven million, six hundred forty-two thousand, six hundred thirty-nine".