91047866 has 32 divisors (see below), whose sum is σ = 169252608. Its totient is φ = 35769600.

The previous prime is 91047857. The next prime is 91047877. The reversal of 91047866 is 66874019.

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, 25826 + ... + 29138.

It is an arithmetic number, because the mean of its divisors is an integer number (5289144).

Almost surely, 2^91047866 is an apocalyptic number.

91047866 is a deficient number, since it is larger than the sum of its proper divisors (78204742).

91047866 is a wasteful number, since it uses less digits than its factorization.

91047866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3486.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 91047866 is about 9541.9005444408. The cubic root of 91047866 is about 449.8729946108.

The spelling of 91047866 in words is "ninety-one million, forty-seven thousand, eight hundred sixty-six".