7978093640 has 32 divisors (see below), whose sum is σ = 19582594560. Its totient is φ = 2901124800.

The previous prime is 7978093639. The next prime is 7978093667. The reversal of 7978093640 is 463908797.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9065576 + ... + 9066455.

It is an arithmetic number, because the mean of its divisors is an integer number (611956080).

Almost surely, 2^7978093640 is an apocalyptic number.

It is an amenable number.

7978093640 is an abundant number, since it is smaller than the sum of its proper divisors (11604500920).

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

7978093640 is a wasteful number, since it uses less digits than its factorization.

7978093640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18132053 (or 18132049 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 53.

The square root of 7978093640 is about 89320.1748766761. The cubic root of 7978093640 is about 1998.1728011806.

The spelling of 7978093640 in words is "seven billion, nine hundred seventy-eight million, ninety-three thousand, six hundred forty".