79890445856 has 24 divisors (see below), whose sum is σ = 169383109644. Its totient is φ = 36872513280.

The previous prime is 79890445823. The next prime is 79890445889. The reversal of 79890445856 is 65854409897.

It is an interprime number because it is at equal distance from previous prime (79890445823) and next prime (79890445889).

It can be written as a sum of positive squares in 2 ways, for example, as 77776285456 + 2114160400 = 278884^2 + 45980^2 .

It is a junction number, because it is equal to n+sod(n) for n = 79890445792 and 79890445801.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 96021755 + ... + 96022586.

Almost surely, 2^79890445856 is an apocalyptic number.

It is an amenable number.

79890445856 is an abundant number, since it is smaller than the sum of its proper divisors (89492663788).

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

79890445856 is a wasteful number, since it uses less digits than its factorization.

79890445856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192044364 (or 192044356 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 65.

The spelling of 79890445856 in words is "seventy-nine billion, eight hundred ninety million, four hundred forty-five thousand, eight hundred fifty-six".