91930688 has 14 divisors (see below), whose sum is σ = 182425086. Its totient is φ = 45965312.

The previous prime is 91930649. The next prime is 91930697. The reversal of 91930688 is 88603919.

It can be written as a sum of positive squares in only one way, i.e., 80425024 + 11505664 = 8968^2 + 3392^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 718145 + ... + 718272.

Almost surely, 2^91930688 is an apocalyptic number.

It is an amenable number.

91930688 is a deficient number, since it is larger than the sum of its proper divisors (90494398).

91930688 is a wasteful number, since it uses less digits than its factorization.

91930688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1436429 (or 1436419 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 91930688 is about 9588.0492280755. The cubic root of 91930688 is about 451.3223458105.

The spelling of 91930688 in words is "ninety-one million, nine hundred thirty thousand, six hundred eighty-eight".