7721331372 has 24 divisors (see below), whose sum is σ = 20018266800. Its totient is φ = 2573777088.

The previous prime is 7721331361. The next prime is 7721331413. The reversal of 7721331372 is 2731331277.

7721331372 is a `hidden beast` number, since 77 + 213 + 3 + 1 + 372 = 666.

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

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35746797 + ... + 35747012.

It is an arithmetic number, because the mean of its divisors is an integer number (834094450).

Almost surely, 2^7721331372 is an apocalyptic number.

It is an amenable number.

7721331372 is an abundant number, since it is smaller than the sum of its proper divisors (12296935428).

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

7721331372 is a wasteful number, since it uses less digits than its factorization.

7721331372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71493822 (or 71493814 counting only the distinct ones).

The product of its digits is 37044, while the sum is 36.

The square root of 7721331372 is about 87871.1065823118. The cubic root of 7721331372 is about 1976.5026323155.

The spelling of 7721331372 in words is "seven billion, seven hundred twenty-one million, three hundred thirty-one thousand, three hundred seventy-two".