91617540 has 48 divisors (see below), whose sum is σ = 293177472. Its totient is φ = 20941056.

The previous prime is 91617527. The next prime is 91617557. The reversal of 91617540 is 4571619.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108649 + ... + 109488.

It is an arithmetic number, because the mean of its divisors is an integer number (6107864).

Almost surely, 2^91617540 is an apocalyptic number.

It is an amenable number.

91617540 is an abundant number, since it is smaller than the sum of its proper divisors (201559932).

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

91617540 is a wasteful number, since it uses less digits than its factorization.

91617540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218156 (or 218154 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 91617540 is about 9571.7051772398. The cubic root of 91617540 is about 450.8093090459.

The spelling of 91617540 in words is "ninety-one million, six hundred seventeen thousand, five hundred forty".