72564564538 has 8 divisors (see below), whose sum is σ = 108875737620. Its totient is φ = 36272652000.

The previous prime is 72564564521. The next prime is 72564564557. The reversal of 72564564538 is 83546546527.

It can be written as a sum of positive squares in 2 ways, for example, as 60129415369 + 12435149169 = 245213^2 + 111513^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 4805713 + ... + 4820788.

Almost surely, 2^72564564538 is an apocalyptic number.

72564564538 is a deficient number, since it is larger than the sum of its proper divisors (36311173082).

72564564538 is a wasteful number, since it uses less digits than its factorization.

72564564538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9630272.

The product of its digits is 24192000, while the sum is 55.

The spelling of 72564564538 in words is "seventy-two billion, five hundred sixty-four million, five hundred sixty-four thousand, five hundred thirty-eight".