91920155488 has 48 divisors (see below), whose sum is σ = 209438369280. Its totient is φ = 38895682176.

The previous prime is 91920155443. The next prime is 91920155497. The reversal of 91920155488 is 88455102919.

It is a happy number.

It is a congruent number.

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, 2579506 + ... + 2614897.

It is an arithmetic number, because the mean of its divisors is an integer number (4363299360).

Almost surely, 2^91920155488 is an apocalyptic number.

It is an amenable number.

91920155488 is an abundant number, since it is smaller than the sum of its proper divisors (117518213792).

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

91920155488 is a wasteful number, since it uses less digits than its factorization.

91920155488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5194499 (or 5194491 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 52.

The spelling of 91920155488 in words is "ninety-one billion, nine hundred twenty million, one hundred fifty-five thousand, four hundred eighty-eight".