642542364 has 36 divisors (see below), whose sum is σ = 1624987000. Its totient is φ = 214077600.

The previous prime is 642542359. The next prime is 642542371. The reversal of 642542364 is 463245246.

642542364 is a `hidden beast` number, since 642 + 5 + 4 + 2 + 3 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 123414 + ... + 128514.

Almost surely, 2^642542364 is an apocalyptic number.

It is an amenable number.

642542364 is an abundant number, since it is smaller than the sum of its proper divisors (982444636).

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

642542364 is a wasteful number, since it uses less digits than its factorization.

642542364 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8610 (or 8605 counting only the distinct ones).

The product of its digits is 138240, while the sum is 36.

The square root of 642542364 is about 25348.4193590054. The cubic root of 642542364 is about 862.9134844147.

The spelling of 642542364 in words is "six hundred forty-two million, five hundred forty-two thousand, three hundred sixty-four".