57642247 has 4 divisors (see below), whose sum is σ = 62076280. Its totient is φ = 53208216.

The previous prime is 57642203. The next prime is 57642251. The reversal of 57642247 is 74224675.

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 57642247 - 2⁷ = 57642119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57642047) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2216997 + ... + 2217022.

It is an arithmetic number, because the mean of its divisors is an integer number (15519070).

Almost surely, 2^57642247 is an apocalyptic number.

57642247 is a deficient number, since it is larger than the sum of its proper divisors (4434033).

57642247 is a wasteful number, since it uses less digits than its factorization.

57642247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4434032.

The product of its digits is 94080, while the sum is 37.

The square root of 57642247 is about 7592.2491397477. The cubic root of 57642247 is about 386.2901498186.

The spelling of 57642247 in words is "fifty-seven million, six hundred forty-two thousand, two hundred forty-seven".