642966 has 16 divisors (see below), whose sum is σ = 1299888. Its totient is φ = 212000.

The previous prime is 642953. The next prime is 642973. The reversal of 642966 is 669246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76 + ... + 1136.

It is an arithmetic number, because the mean of its divisors is an integer number (81243).

2⁶⁴²⁹⁶⁶ is an apocalyptic number.

642966 is an abundant number, since it is smaller than the sum of its proper divisors (656922).

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

642966 is a wasteful number, since it uses less digits than its factorization.

642966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1167.

The product of its digits is 15552, while the sum is 33.

The square root of 642966 is about 801.8516072192. The cubic root of 642966 is about 86.3103085872.

The spelling of 642966 in words is "six hundred forty-two thousand, nine hundred sixty-six".