7578139664 has 40 divisors (see below), whose sum is σ = 15462180000. Its totient is φ = 3588074496.

The previous prime is 7578139649. The next prime is 7578139703. The reversal of 7578139664 is 4669318757.

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, 986912 + ... + 994560.

It is an arithmetic number, because the mean of its divisors is an integer number (386554500).

Almost surely, 2^7578139664 is an apocalyptic number.

It is an amenable number.

7578139664 is an abundant number, since it is smaller than the sum of its proper divisors (7884040336).

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

7578139664 is a wasteful number, since it uses less digits than its factorization.

7578139664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10935 (or 10929 counting only the distinct ones).

The product of its digits is 7620480, while the sum is 56.

The square root of 7578139664 is about 87052.5109574675. The cubic root of 7578139664 is about 1964.2082689030.

The spelling of 7578139664 in words is "seven billion, five hundred seventy-eight million, one hundred thirty-nine thousand, six hundred sixty-four".