91540980 has 72 divisors (see below), whose sum is σ = 284155872. Its totient is φ = 23841216.

The previous prime is 91540951. The next prime is 91541011. The reversal of 91540980 is 8904519.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1827 + ... + 13653.

Almost surely, 2^91540980 is an apocalyptic number.

91540980 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91540980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142077936).

91540980 is an abundant number, since it is smaller than the sum of its proper divisors (192614892).

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

91540980 is a wasteful number, since it uses less digits than its factorization.

91540980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11885 (or 11880 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 91540980 is about 9567.7050539824. The cubic root of 91540980 is about 450.6837014421.

The spelling of 91540980 in words is "ninety-one million, five hundred forty thousand, nine hundred eighty".