642854646 has 48 divisors (see below), whose sum is σ = 1661048064. Its totient is φ = 175686192.

The previous prime is 642854603. The next prime is 642854651. The reversal of 642854646 is 646458246.

642854646 is a `hidden beast` number, since 64 + 2 + 8 + 546 + 46 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 108016 + ... + 113811.

It is an arithmetic number, because the mean of its divisors is an integer number (34605168).

Almost surely, 2^642854646 is an apocalyptic number.

642854646 is an abundant number, since it is smaller than the sum of its proper divisors (1018193418).

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

642854646 is a wasteful number, since it uses less digits than its factorization.

642854646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221865 (or 221862 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 45.

The square root of 642854646 is about 25354.5784031208. The cubic root of 642854646 is about 863.0532566280.

The spelling of 642854646 in words is "six hundred forty-two million, eight hundred fifty-four thousand, six hundred forty-six".