91685690 has 16 divisors (see below), whose sum is σ = 166129920. Its totient is φ = 36430800.

The previous prime is 91685683. The next prime is 91685719. The reversal of 91685690 is 9658619.

It is a super-2 number, since 2×91685690² = 16812531501552200, which contains 22 as substring.

It is a Curzon number.

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, 28850 + ... + 31869.

It is an arithmetic number, because the mean of its divisors is an integer number (10383120).

Almost surely, 2^91685690 is an apocalyptic number.

91685690 is a deficient number, since it is larger than the sum of its proper divisors (74444230).

91685690 is a wasteful number, since it uses less digits than its factorization.

91685690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60877.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 91685690 is about 9575.2644872087. The cubic root of 91685690 is about 450.9210599903.

The spelling of 91685690 in words is "ninety-one million, six hundred eighty-five thousand, six hundred ninety".