642475 has 12 divisors (see below), whose sum is σ = 823360. Its totient is φ = 496800.

The previous prime is 642457. The next prime is 642487. The reversal of 642475 is 574246.

It is a de Polignac number, because none of the positive numbers 2^k-642475 is a prime.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 361 + ... + 1189.

2⁶⁴²⁴⁷⁵ is an apocalyptic number.

642475 is a deficient number, since it is larger than the sum of its proper divisors (180885).

642475 is a wasteful number, since it uses less digits than its factorization.

642475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 870 (or 865 counting only the distinct ones).

The product of its digits is 6720, while the sum is 28.

The square root of 642475 is about 801.5453823708. The cubic root of 642475 is about 86.2883327474.

The spelling of 642475 in words is "six hundred forty-two thousand, four hundred seventy-five".