91550120872 has 32 divisors (see below), whose sum is σ = 196236720000. Its totient is φ = 39224188224.

The previous prime is 91550120839. The next prime is 91550120891. The reversal of 91550120872 is 27802105519.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48372 + ... + 430627.

It is an arithmetic number, because the mean of its divisors is an integer number (6132397500).

Almost surely, 2^91550120872 is an apocalyptic number.

It is an amenable number.

91550120872 is an abundant number, since it is smaller than the sum of its proper divisors (104686599128).

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

91550120872 is a wasteful number, since it uses less digits than its factorization.

91550120872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482425 (or 482421 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 40.

The spelling of 91550120872 in words is "ninety-one billion, five hundred fifty million, one hundred twenty thousand, eight hundred seventy-two".