642575 has 6 divisors (see below), whose sum is σ = 796824. Its totient is φ = 514040.

The previous prime is 642563. The next prime is 642581. The reversal of 642575 is 575246.

It is not a de Polignac number, because 642575 - 2¹⁰ = 641551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 12827 + ... + 12876.

It is an arithmetic number, because the mean of its divisors is an integer number (132804).

2⁶⁴²⁵⁷⁵ is an apocalyptic number.

642575 is a deficient number, since it is larger than the sum of its proper divisors (154249).

642575 is a wasteful number, since it uses less digits than its factorization.

642575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25713 (or 25708 counting only the distinct ones).

The product of its digits is 8400, while the sum is 29.

The square root of 642575 is about 801.6077594435. The cubic root of 642575 is about 86.2928093863.

The spelling of 642575 in words is "six hundred forty-two thousand, five hundred seventy-five".