642515520 has 56 divisors (see below), whose sum is σ = 2039989824. Its totient is φ = 171337216.

The previous prime is 642515513. The next prime is 642515537. The reversal of 642515520 is 25515246.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 333684 + ... + 335603.

Almost surely, 2^642515520 is an apocalyptic number.

642515520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

642515520 is an abundant number, since it is smaller than the sum of its proper divisors (1397474304).

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

642515520 is a wasteful number, since it uses less digits than its factorization.

642515520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669307 (or 669297 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 642515520 is about 25347.8898530035. The cubic root of 642515520 is about 862.9014673745.

It can be divided in two parts, 6425 and 15520, that added together give a triangular number (21945 = T₂₀₉).

The spelling of 642515520 in words is "six hundred forty-two million, five hundred fifteen thousand, five hundred twenty".