7231312728 has 24 divisors (see below), whose sum is σ = 19584805500. Its totient is φ = 2410437552.

The previous prime is 7231312703. The next prime is 7231312783. The reversal of 7231312728 is 8272131327.

7231312728 is a `hidden beast` number, since 72 + 313 + 1 + 272 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a junction number, because it is equal to n+sod(n) for n = 7231312692 and 7231312701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50217378 + ... + 50217521.

Almost surely, 2^7231312728 is an apocalyptic number.

It is an amenable number.

7231312728 is an abundant number, since it is smaller than the sum of its proper divisors (12353492772).

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

7231312728 is a wasteful number, since it uses less digits than its factorization.

7231312728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100434911 (or 100434904 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 7231312728 is about 85037.1255864167. The cubic root of 7231312728 is about 1933.7739901088.

The spelling of 7231312728 in words is "seven billion, two hundred thirty-one million, three hundred twelve thousand, seven hundred twenty-eight".