642522288 has 20 divisors (see below), whose sum is σ = 1659849368. Its totient is φ = 214174080.

The previous prime is 642522271. The next prime is 642522299. The reversal of 642522288 is 882225246.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6692893 + ... + 6692988.

Almost surely, 2^642522288 is an apocalyptic number.

It is an amenable number.

642522288 is an abundant number, since it is smaller than the sum of its proper divisors (1017327080).

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

642522288 is a wasteful number, since it uses less digits than its factorization.

642522288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13385892 (or 13385886 counting only the distinct ones).

The product of its digits is 122880, while the sum is 39.

The square root of 642522288 is about 25348.0233548890. The cubic root of 642522288 is about 862.9044971829.

The spelling of 642522288 in words is "six hundred forty-two million, five hundred twenty-two thousand, two hundred eighty-eight".