91980920 has 16 divisors (see below), whose sum is σ = 206957160. Its totient is φ = 36792352.

The previous prime is 91980907. The next prime is 91980961. The reversal of 91980920 is 2908919.

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, 1149722 + ... + 1149801.

Almost surely, 2^91980920 is an apocalyptic number.

It is an amenable number.

91980920 is an abundant number, since it is smaller than the sum of its proper divisors (114976240).

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

91980920 is a wasteful number, since it uses less digits than its factorization.

91980920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2299534 (or 2299530 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 38.

The square root of 91980920 is about 9590.6683812965. The cubic root of 91980920 is about 451.4045334405.

The spelling of 91980920 in words is "ninety-one million, nine hundred eighty thousand, nine hundred twenty".