91615616 has 32 divisors (see below), whose sum is σ = 184314000. Its totient is φ = 45356544.

The previous prime is 91615603. The next prime is 91615637. The reversal of 91615616 is 61651619.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9710 + ... + 16658.

Almost surely, 2^91615616 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91615616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92157000).

91615616 is an abundant number, since it is smaller than the sum of its proper divisors (92698384).

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

91615616 is a wasteful number, since it uses less digits than its factorization.

91615616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7066 (or 7054 counting only the distinct ones).

The product of its digits is 9720, while the sum is 35.

The square root of 91615616 is about 9571.6046721540. The cubic root of 91615616 is about 450.8061533067.

The spelling of 91615616 in words is "ninety-one million, six hundred fifteen thousand, six hundred sixteen".