91378172 has 12 divisors (see below), whose sum is σ = 166864656. Its totient is φ = 43702560.

The previous prime is 91378141. The next prime is 91378187. The reversal of 91378172 is 27187319.

It is a super-3 number, since 3×91378172³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496529 + ... + 496712.

It is an arithmetic number, because the mean of its divisors is an integer number (13905388).

Almost surely, 2^91378172 is an apocalyptic number.

91378172 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

91378172 is a deficient number, since it is larger than the sum of its proper divisors (75486484).

91378172 is a wasteful number, since it uses less digits than its factorization.

91378172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 993268 (or 993266 counting only the distinct ones).

The product of its digits is 21168, while the sum is 38.

The square root of 91378172 is about 9559.1930621784. The cubic root of 91378172 is about 450.4163586818.

The spelling of 91378172 in words is "ninety-one million, three hundred seventy-eight thousand, one hundred seventy-two".