7991211264 has 72 divisors (see below), whose sum is σ = 22193032512. Its totient is φ = 2547916800.

The previous prime is 7991211259. The next prime is 7991211269. The reversal of 7991211264 is 4621121997.

It is an interprime number because it is at equal distance from previous prime (7991211259) and next prime (7991211269).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7991211269) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 208537 + ... + 243864.

Almost surely, 2^7991211264 is an apocalyptic number.

It is an amenable number.

7991211264 is an abundant number, since it is smaller than the sum of its proper divisors (14201821248).

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

7991211264 is a wasteful number, since it uses less digits than its factorization.

7991211264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452443 (or 452429 counting only the distinct ones).

The product of its digits is 54432, while the sum is 42.

The square root of 7991211264 is about 89393.5750711426. The cubic root of 7991211264 is about 1999.2673369685.

The spelling of 7991211264 in words is "seven billion, nine hundred ninety-one million, two hundred eleven thousand, two hundred sixty-four".