91579140 has 48 divisors (see below), whose sum is σ = 284914560. Its totient is φ = 24420960.

The previous prime is 91579139. The next prime is 91579141. The reversal of 91579140 is 4197519.

It is an interprime number because it is at equal distance from previous prime (91579139) and next prime (91579141).

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

It is a junction number, because it is equal to n+sod(n) for n = 91579095 and 91579104.

It is not an unprimeable number, because it can be changed into a prime (91579141) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84256 + ... + 85335.

It is an arithmetic number, because the mean of its divisors is an integer number (5935720).

Almost surely, 2^91579140 is an apocalyptic number.

91579140 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

91579140 is an abundant number, since it is smaller than the sum of its proper divisors (193335420).

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

91579140 is a wasteful number, since it uses less digits than its factorization.

91579140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169609 (or 169601 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 91579140 is about 9569.6990548293. The cubic root of 91579140 is about 450.7463171174.

It can be divided in two parts, 91579 and 140, that added together give a palindrome (91719).

The spelling of 91579140 in words is "ninety-one million, five hundred seventy-nine thousand, one hundred forty".