642875 has 16 divisors (see below), whose sum is σ = 829920. Its totient is φ = 496800.

The previous prime is 642871. The next prime is 642877. The reversal of 642875 is 578246.

It is not a de Polignac number, because 642875 - 2² = 642871 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4556 + ... + 4694.

It is an arithmetic number, because the mean of its divisors is an integer number (51870).

2⁶⁴²⁸⁷⁵ is an apocalyptic number.

642875 is a deficient number, since it is larger than the sum of its proper divisors (187045).

642875 is a wasteful number, since it uses less digits than its factorization.

642875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 191 (or 181 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 642875 is about 801.7948615450. The cubic root of 642875 is about 86.3062365167.

The spelling of 642875 in words is "six hundred forty-two thousand, eight hundred seventy-five".