91618672 has 20 divisors (see below), whose sum is σ = 177661000. Its totient is φ = 45770688.

The previous prime is 91618633. The next prime is 91618687. The reversal of 91618672 is 27681619.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31954 + ... + 34702.

It is an arithmetic number, because the mean of its divisors is an integer number (8883050).

Almost surely, 2^91618672 is an apocalyptic number.

It is an amenable number.

91618672 is a deficient number, since it is larger than the sum of its proper divisors (86042328).

91618672 is a wasteful number, since it uses less digits than its factorization.

91618672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4840 (or 4834 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 91618672 is about 9571.7643096767. The cubic root of 91618672 is about 450.8111657284.

The spelling of 91618672 in words is "ninety-one million, six hundred eighteen thousand, six hundred seventy-two".