642595 has 4 divisors (see below), whose sum is σ = 771120. Its totient is φ = 514072.

The previous prime is 642581. The next prime is 642613. The reversal of 642595 is 595246.

642595 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 595246 = 2 ⋅297623.

It is a cyclic number.

It is not a de Polignac number, because 642595 - 2⁵ = 642563 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64255 + ... + 64264.

It is an arithmetic number, because the mean of its divisors is an integer number (192780).

2⁶⁴²⁵⁹⁵ is an apocalyptic number.

642595 is a deficient number, since it is larger than the sum of its proper divisors (128525).

642595 is a wasteful number, since it uses less digits than its factorization.

642595 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128524.

The product of its digits is 10800, while the sum is 31.

The square root of 642595 is about 801.6202342756. The cubic root of 642595 is about 86.2937046583.

The spelling of 642595 in words is "six hundred forty-two thousand, five hundred ninety-five".