72816877064 has 16 divisors (see below), whose sum is σ = 137062899900. Its totient is φ = 36266770432.

The previous prime is 72816877061. The next prime is 72816877127. The reversal of 72816877064 is 46077861827.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 51140204164 + 21676672900 = 226142^2 + 147230^2 .

It is not an unprimeable number, because it can be changed into a prime (72816877061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17706329 + ... + 17710440.

Almost surely, 2^72816877064 is an apocalyptic number.

It is an amenable number.

72816877064 is a deficient number, since it is larger than the sum of its proper divisors (64246022836).

72816877064 is a wasteful number, since it uses less digits than its factorization.

72816877064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35417032 (or 35417028 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 56.

The spelling of 72816877064 in words is "seventy-two billion, eight hundred sixteen million, eight hundred seventy-seven thousand, sixty-four".