91871801976 has 64 divisors (see below), whose sum is σ = 230174110080. Its totient is φ = 30558072960.

The previous prime is 91871801947. The next prime is 91871802073. The reversal of 91871801976 is 67910817819.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28825455 + ... + 28828641.

It is an arithmetic number, because the mean of its divisors is an integer number (3596470470).

Almost surely, 2^91871801976 is an apocalyptic number.

It is an amenable number.

91871801976 is an abundant number, since it is smaller than the sum of its proper divisors (138302308104).

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

91871801976 is a wasteful number, since it uses less digits than its factorization.

91871801976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5404 (or 5400 counting only the distinct ones).

The product of its (nonzero) digits is 1524096, while the sum is 57.

The spelling of 91871801976 in words is "ninety-one billion, eight hundred seventy-one million, eight hundred one thousand, nine hundred seventy-six".