616520538 has 32 divisors (see below), whose sum is σ = 1450638720. Its totient is φ = 193417920.

The previous prime is 616520537. The next prime is 616520549. The reversal of 616520538 is 835025616.

616520538 is a `hidden beast` number, since 61 + 65 + 2 + 0 + 538 = 666.

It is not an unprimeable number, because it can be changed into a prime (616520537) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 334878 + ... + 336713.

It is an arithmetic number, because the mean of its divisors is an integer number (45332460).

Almost surely, 2^616520538 is an apocalyptic number.

616520538 is an abundant number, since it is smaller than the sum of its proper divisors (834118182).

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

616520538 is a wasteful number, since it uses less digits than its factorization.

616520538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 671619 (or 671613 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 616520538 is about 24829.8316144109. The cubic root of 616520538 is about 851.1037739088.

The spelling of 616520538 in words is "six hundred sixteen million, five hundred twenty thousand, five hundred thirty-eight".