91690418 has 16 divisors (see below), whose sum is σ = 145981440. Its totient is φ = 43043136.

The previous prime is 91690399. The next prime is 91690433. The reversal of 91690418 is 81409619.

It is a happy 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, 11855 + ... + 17997.

It is an arithmetic number, because the mean of its divisors is an integer number (9123840).

Almost surely, 2^91690418 is an apocalyptic number.

91690418 is a deficient number, since it is larger than the sum of its proper divisors (54291022).

91690418 is a wasteful number, since it uses less digits than its factorization.

91690418 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6601.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 91690418 is about 9575.5113701567. The cubic root of 91690418 is about 450.9288108113.

The spelling of 91690418 in words is "ninety-one million, six hundred ninety thousand, four hundred eighteen".