72643128164 has 24 divisors (see below), whose sum is σ = 127625695008. Its totient is φ = 36178845120.

The previous prime is 72643128163. The next prime is 72643128197. The reversal of 72643128164 is 46182134627.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (72643128163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1462424 + ... + 1511280.

It is an arithmetic number, because the mean of its divisors is an integer number (5317737292).

Almost surely, 2^72643128164 is an apocalyptic number.

It is an amenable number.

72643128164 is a deficient number, since it is larger than the sum of its proper divisors (54982566844).

72643128164 is a wasteful number, since it uses less digits than its factorization.

72643128164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50315 (or 50313 counting only the distinct ones).

The product of its digits is 387072, while the sum is 44.

The spelling of 72643128164 in words is "seventy-two billion, six hundred forty-three million, one hundred twenty-eight thousand, one hundred sixty-four".