91680694 has 32 divisors (see below), whose sum is σ = 166950720. Its totient is φ = 36860928.

The previous prime is 91680683. The next prime is 91680697. The reversal of 91680694 is 49608619.

It is a self number, because there is not a number n which added to its sum of digits gives 91680694.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91680697) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135084 + ... + 135760.

It is an arithmetic number, because the mean of its divisors is an integer number (5217210).

Almost surely, 2^91680694 is an apocalyptic number.

91680694 is a deficient number, since it is larger than the sum of its proper divisors (75270026).

91680694 is a wasteful number, since it uses less digits than its factorization.

91680694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1272.

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 91680694 is about 9575.0036031325. The cubic root of 91680694 is about 450.9128695353.

The spelling of 91680694 in words is "ninety-one million, six hundred eighty thousand, six hundred ninety-four".