91620616 has 32 divisors (see below), whose sum is σ = 186135840. Its totient is φ = 42110208.

The previous prime is 91620589. The next prime is 91620637. The reversal of 91620616 is 61602619.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1986 + ... + 13681.

It is an arithmetic number, because the mean of its divisors is an integer number (5816745).

Almost surely, 2^91620616 is an apocalyptic number.

It is an amenable number.

91620616 is an abundant number, since it is smaller than the sum of its proper divisors (94515224).

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

91620616 is a wasteful number, since it uses less digits than its factorization.

91620616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15733 (or 15729 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 91620616 is about 9571.8658578148. The cubic root of 91620616 is about 450.8143542003.

The spelling of 91620616 in words is "ninety-one million, six hundred twenty thousand, six hundred sixteen".