91540764 has 36 divisors (see below), whose sum is σ = 264451824. Its totient is φ = 26154432.

The previous prime is 91540753. The next prime is 91540769. The reversal of 91540764 is 46704519.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×91540764² = 16759422947407392, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91540769) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 181377 + ... + 181880.

It is an arithmetic number, because the mean of its divisors is an integer number (7345884).

Almost surely, 2^91540764 is an apocalyptic number.

It is an amenable number.

91540764 is an abundant number, since it is smaller than the sum of its proper divisors (172911060).

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

91540764 is a wasteful number, since it uses less digits than its factorization.

91540764 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363274 (or 363269 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 91540764 is about 9567.6937660023. The cubic root of 91540764 is about 450.6833469642.

The spelling of 91540764 in words is "ninety-one million, five hundred forty thousand, seven hundred sixty-four".