642506 has 16 divisors (see below), whose sum is σ = 1022208. Its totient is φ = 302400.

The previous prime is 642487. The next prime is 642517. The reversal of 642506 is 605246.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642506.

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 7 ways as a sum of consecutive naturals, for example, 2546 + ... + 2786.

It is an arithmetic number, because the mean of its divisors is an integer number (63888).

2⁶⁴²⁵⁰⁶ is an apocalyptic number.

642506 is a deficient number, since it is larger than the sum of its proper divisors (379702).

642506 is a wasteful number, since it uses less digits than its factorization.

642506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 642506 is about 801.5647197825. The cubic root of 642506 is about 86.2897205551.

The spelling of 642506 in words is "six hundred forty-two thousand, five hundred six".