642573057 has 32 divisors (see below), whose sum is σ = 1023897600. Its totient is φ = 350475840.

The previous prime is 642573047. The next prime is 642573059. The reversal of 642573057 is 750375246.

It is not a de Polignac number, because 642573057 - 2¹⁸ = 642310913 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642573059) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 288207 + ... + 290427.

It is an arithmetic number, because the mean of its divisors is an integer number (31996800).

Almost surely, 2^642573057 is an apocalyptic number.

It is an amenable number.

642573057 is a deficient number, since it is larger than the sum of its proper divisors (381324543).

642573057 is a wasteful number, since it uses less digits than its factorization.

642573057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853.

The product of its (nonzero) digits is 176400, while the sum is 39.

The square root of 642573057 is about 25349.0247741407. The cubic root of 642573057 is about 862.9272240960.

The spelling of 642573057 in words is "six hundred forty-two million, five hundred seventy-three thousand, fifty-seven".