91988867 has 8 divisors (see below), whose sum is σ = 94071024. Its totient is φ = 89919648.

The previous prime is 91988857. The next prime is 91988879. The reversal of 91988867 is 76888919.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91988867 - 2⁴ = 91988851 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91988857) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11933 + ... + 18065.

It is an arithmetic number, because the mean of its divisors is an integer number (11758878).

Almost surely, 2^91988867 is an apocalyptic number.

91988867 is a deficient number, since it is larger than the sum of its proper divisors (2082157).

91988867 is a wasteful number, since it uses less digits than its factorization.

91988867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6469.

The product of its digits is 1741824, while the sum is 56.

The square root of 91988867 is about 9591.0826813244. The cubic root of 91988867 is about 451.4175332689.

The spelling of 91988867 in words is "ninety-one million, nine hundred eighty-eight thousand, eight hundred sixty-seven".