642263440 has 80 divisors (see below), whose sum is σ = 1837882368. Its totient is φ = 203263488.

The previous prime is 642263429. The next prime is 642263459. The reversal of 642263440 is 44362246.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36832 + ... + 51391.

Almost surely, 2^642263440 is an apocalyptic number.

It is an amenable number.

642263440 is an abundant number, since it is smaller than the sum of its proper divisors (1195618928).

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

642263440 is a wasteful number, since it uses less digits than its factorization.

642263440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88256 (or 88250 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 642263440 is about 25342.9169591821. The cubic root of 642263440 is about 862.7886043914.

The spelling of 642263440 in words is "six hundred forty-two million, two hundred sixty-three thousand, four hundred forty".