91666190 has 32 divisors (see below), whose sum is σ = 205714944. Its totient is φ = 28571040.

The previous prime is 91666171. The next prime is 91666219. The reversal of 91666190 is 9166619.

It is a super-2 number, since 2×91666190² = 16805380778232200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58754 + ... + 60293.

It is an arithmetic number, because the mean of its divisors is an integer number (6428592).

Almost surely, 2^91666190 is an apocalyptic number.

91666190 is an abundant number, since it is smaller than the sum of its proper divisors (114048754).

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

91666190 is a wasteful number, since it uses less digits than its factorization.

91666190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119072.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 91666190 is about 9574.2461844262. The cubic root of 91666190 is about 450.8890899554.

The spelling of 91666190 in words is "ninety-one million, six hundred sixty-six thousand, one hundred ninety".