91628668 has 12 divisors (see below), whose sum is σ = 161247240. Its totient is φ = 45558032.

The previous prime is 91628639. The next prime is 91628681. The reversal of 91628668 is 86682619.

91628668 is nontrivially palindromic in base 14.

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, 63271 + ... + 64702.

It is an arithmetic number, because the mean of its divisors is an integer number (13437270).

Almost surely, 2^91628668 is an apocalyptic number.

It is an amenable number.

91628668 is a deficient number, since it is larger than the sum of its proper divisors (69618572).

91628668 is a wasteful number, since it uses less digits than its factorization.

91628668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128156 (or 128154 counting only the distinct ones).

The product of its digits is 248832, while the sum is 46.

The square root of 91628668 is about 9572.2864562235. The cubic root of 91628668 is about 450.8275602923.

It can be divided in two parts, 916 and 28668, that added together give a square (29584 = 172²).

The spelling of 91628668 in words is "ninety-one million, six hundred twenty-eight thousand, six hundred sixty-eight".