7971923520 has 168 divisors, whose sum is σ = 29912950080. Its totient is φ = 1932579840.

The previous prime is 7971923507. The next prime is 7971923567. The reversal of 7971923520 is 253291797.

7971923520 is a `hidden beast` number, since 7 + 97 + 19 + 23 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 94140 + ... + 157499.

Almost surely, 2^7971923520 is an apocalyptic number.

It is an amenable number.

7971923520 is an abundant number, since it is smaller than the sum of its proper divisors (21941026560).

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

7971923520 is a wasteful number, since it uses less digits than its factorization.

7971923520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251673 (or 251660 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 7971923520 is about 89285.6288548163. The cubic root of 7971923520 is about 1997.6575508705.

The spelling of 7971923520 in words is "seven billion, nine hundred seventy-one million, nine hundred twenty-three thousand, five hundred twenty".