7911444864 has 64 divisors (see below), whose sum is σ = 21132360000. Its totient is φ = 2622392832.

The previous prime is 7911444857. The next prime is 7911444899. The reversal of 7911444864 is 4684441197.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×7911444864² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

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, 11187 + ... + 126285.

It is an arithmetic number, because the mean of its divisors is an integer number (330193125).

Almost surely, 2^7911444864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7911444864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10566180000).

7911444864 is an abundant number, since it is smaller than the sum of its proper divisors (13220915136).

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

7911444864 is a wasteful number, since it uses less digits than its factorization.

7911444864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115295 (or 115283 counting only the distinct ones).

The product of its digits is 774144, while the sum is 48.

The square root of 7911444864 is about 88946.3032621368. The cubic root of 7911444864 is about 1992.5930074283.

The spelling of 7911444864 in words is "seven billion, nine hundred eleven million, four hundred forty-four thousand, eight hundred sixty-four".