78579648778 has 16 divisors (see below), whose sum is σ = 119224076040. Its totient is φ = 38838514176.

The previous prime is 78579648739. The next prime is 78579648809. The reversal of 78579648778 is 87784697587.

It can be written as a sum of positive squares in 4 ways, for example, as 45668972209 + 32910676569 = 213703^2 + 181413^2 .

It is a super-2 number, since 2×78579648778² (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 7 ways as a sum of consecutive naturals, for example, 674626 + ... + 782482.

Almost surely, 2^78579648778 is an apocalyptic number.

78579648778 is a deficient number, since it is larger than the sum of its proper divisors (40644427262).

78579648778 is a wasteful number, since it uses less digits than its factorization.

78579648778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112041.

The product of its digits is 1327656960, while the sum is 76.

The spelling of 78579648778 in words is "seventy-eight billion, five hundred seventy-nine million, six hundred forty-eight thousand, seven hundred seventy-eight".