642968 has 16 divisors (see below), whose sum is σ = 1215000. Its totient is φ = 318976.

The previous prime is 642953. The next prime is 642973. The reversal of 642968 is 869246.

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, 1208 + ... + 1656.

2⁶⁴²⁹⁶⁸ is an apocalyptic number.

It is an amenable number.

642968 is a deficient number, since it is larger than the sum of its proper divisors (572032).

642968 is a wasteful number, since it uses less digits than its factorization.

642968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 630 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 642968 is about 801.8528543318. The cubic root of 642968 is about 86.3103980790.

The spelling of 642968 in words is "six hundred forty-two thousand, nine hundred sixty-eight".