91878687796 has 12 divisors (see below), whose sum is σ = 183757375648. Its totient is φ = 39376580472.

The previous prime is 91878687787. The next prime is 91878687821. The reversal of 91878687796 is 69778687819.

91878687796 is an admirable number.

It is a super-2 number, since 2×91878687796² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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, 1640690826 + ... + 1640690881.

Almost surely, 2^91878687796 is an apocalyptic number.

It is an amenable number.

91878687796 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

91878687796 is a wasteful number, since it uses less digits than its factorization.

91878687796 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281381718 (or 3281381716 counting only the distinct ones).

The product of its digits is 512096256, while the sum is 76.

The spelling of 91878687796 in words is "ninety-one billion, eight hundred seventy-eight million, six hundred eighty-seven thousand, seven hundred ninety-six".