91908616 has 8 divisors (see below), whose sum is σ = 172328670. Its totient is φ = 45954304.

The previous prime is 91908611. The next prime is 91908623. The reversal of 91908616 is 61680919.

It can be written as a sum of positive squares in only one way, i.e., 67996516 + 23912100 = 8246^2 + 4890^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (91908611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5744281 + ... + 5744296.

Almost surely, 2^91908616 is an apocalyptic number.

It is an amenable number.

91908616 is a deficient number, since it is larger than the sum of its proper divisors (80420054).

91908616 is a wasteful number, since it uses less digits than its factorization.

91908616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11488583 (or 11488579 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 91908616 is about 9586.8981427780. The cubic root of 91908616 is about 451.2862230011.

The spelling of 91908616 in words is "ninety-one million, nine hundred eight thousand, six hundred sixteen".