91370540 has 12 divisors (see below), whose sum is σ = 191878176. Its totient is φ = 36548208.

The previous prime is 91370537. The next prime is 91370549. The reversal of 91370540 is 4507319.

It is not an unprimeable number, because it can be changed into a prime (91370549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2284244 + ... + 2284283.

It is an arithmetic number, because the mean of its divisors is an integer number (15989848).

Almost surely, 2^91370540 is an apocalyptic number.

It is an amenable number.

91370540 is an abundant number, since it is smaller than the sum of its proper divisors (100507636).

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

91370540 is a wasteful number, since it uses less digits than its factorization.

91370540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4568536 (or 4568534 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 91370540 is about 9558.7938569675. The cubic root of 91370540 is about 450.4038185850.

Adding to 91370540 its reverse (4507319), we get a palindrome (95877859).

The spelling of 91370540 in words is "ninety-one million, three hundred seventy thousand, five hundred forty".