91996879660 has 36 divisors (see below), whose sum is σ = 224735236992. Its totient is φ = 31541786976.

The previous prime is 91996879651. The next prime is 91996879687. The reversal of 91996879660 is 6697869919.

It is a Smith number, since the sum of its digits (70) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (70).

It is a self number, because there is not a number n which added to its sum of digits gives 91996879660.

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, 46936204 + ... + 46938163.

It is an arithmetic number, because the mean of its divisors is an integer number (6242645472).

Almost surely, 2^91996879660 is an apocalyptic number.

It is an amenable number.

91996879660 is an abundant number, since it is smaller than the sum of its proper divisors (132738357332).

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

91996879660 is a wasteful number, since it uses less digits than its factorization.

91996879660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93874390 (or 93874381 counting only the distinct ones).

The product of its (nonzero) digits is 79361856, while the sum is 70.

The spelling of 91996879660 in words is "ninety-one billion, nine hundred ninety-six million, eight hundred seventy-nine thousand, six hundred sixty".