78961040064 has 84 divisors (see below), whose sum is σ = 226454197840. Its totient is φ = 26305620480.

The previous prime is 78961040027. The next prime is 78961040089. The reversal of 78961040064 is 46004016987.

It is a super-2 number, since 2×78961040064² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1017222 + ... + 1092090.

Almost surely, 2^78961040064 is an apocalyptic number.

It is an amenable number.

78961040064 is an abundant number, since it is smaller than the sum of its proper divisors (147493157776).

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

78961040064 is a wasteful number, since it uses less digits than its factorization.

78961040064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76718 (or 76705 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 78961040064 in words is "seventy-eight billion, nine hundred sixty-one million, forty thousand, sixty-four".