91889667 has 16 divisors (see below), whose sum is σ = 139300480. Its totient is φ = 59834376.

The previous prime is 91889663. The next prime is 91889683. The reversal of 91889667 is 76698819.

It is not a de Polignac number, because 91889667 - 2² = 91889663 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91889663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38413 + ... + 40734.

It is an arithmetic number, because the mean of its divisors is an integer number (8706280).

Almost surely, 2^91889667 is an apocalyptic number.

91889667 is a deficient number, since it is larger than the sum of its proper divisors (47410813).

91889667 is a wasteful number, since it uses less digits than its factorization.

91889667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79199 (or 79193 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 54.

The square root of 91889667 is about 9585.9098159747. The cubic root of 91889667 is about 451.2552066475.

The spelling of 91889667 in words is "ninety-one million, eight hundred eighty-nine thousand, six hundred sixty-seven".