72195621012 has 72 divisors (see below), whose sum is σ = 201630776256. Its totient is φ = 21664836864.

The previous prime is 72195620999. The next prime is 72195621019. The reversal of 72195621012 is 21012659127.

72195621012 is a `hidden beast` number, since 7 + 2 + 19 + 5 + 621 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72195621019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2550418 + ... + 2578569.

It is an arithmetic number, because the mean of its divisors is an integer number (2800427448).

Almost surely, 2^72195621012 is an apocalyptic number.

It is an amenable number.

72195621012 is an abundant number, since it is smaller than the sum of its proper divisors (129435155244).

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

72195621012 is a wasteful number, since it uses less digits than its factorization.

72195621012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5129037 (or 5129032 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The spelling of 72195621012 in words is "seventy-two billion, one hundred ninety-five million, six hundred twenty-one thousand, twelve".