642485240 has 64 divisors (see below), whose sum is σ = 1474308000. Its totient is φ = 251942400.

The previous prime is 642485189. The next prime is 642485251. The reversal of 642485240 is 42584246.

It is a self number, because there is not a number n which added to its sum of digits gives 642485240.

It is a congruent number.

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, 439631 + ... + 441089.

Almost surely, 2^642485240 is an apocalyptic number.

It is an amenable number.

642485240 is an abundant number, since it is smaller than the sum of its proper divisors (831822760).

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

642485240 is a wasteful number, since it uses less digits than its factorization.

642485240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 35.

The square root of 642485240 is about 25347.2925575889. The cubic root of 642485240 is about 862.8879117658.

The spelling of 642485240 in words is "six hundred forty-two million, four hundred eighty-five thousand, two hundred forty".