79447891780 has 12 divisors (see below), whose sum is σ = 166840572780. Its totient is φ = 31779156704.

The previous prime is 79447891771. The next prime is 79447891879. The reversal of 79447891780 is 8719874497.

It can be written as a sum of positive squares in 2 ways, for example, as 23313014596 + 56134877184 = 152686^2 + 236928^2 .

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, 1986197275 + ... + 1986197314.

It is an arithmetic number, because the mean of its divisors is an integer number (13903381065).

Almost surely, 2^79447891780 is an apocalyptic number.

It is an amenable number.

79447891780 is an abundant number, since it is smaller than the sum of its proper divisors (87392681000).

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

79447891780 is a wasteful number, since it uses less digits than its factorization.

79447891780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3972394598 (or 3972394596 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 64.

The spelling of 79447891780 in words is "seventy-nine billion, four hundred forty-seven million, eight hundred ninety-one thousand, seven hundred eighty".