642964 has 12 divisors (see below), whose sum is σ = 1285984. Its totient is φ = 275544.

The previous prime is 642953. The next prime is 642973. The reversal of 642964 is 469246.

642964 is an admirable number.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 11454 + ... + 11509.

2⁶⁴²⁹⁶⁴ is an apocalyptic number.

It is an amenable number.

642964 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642964 is a wasteful number, since it uses less digits than its factorization.

642964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22974 (or 22972 counting only the distinct ones).

The product of its digits is 10368, while the sum is 31.

The square root of 642964 is about 801.8503601047. The cubic root of 642964 is about 86.3102190953.

The spelling of 642964 in words is "six hundred forty-two thousand, nine hundred sixty-four".