91879487 has 8 divisors (see below), whose sum is σ = 105446400. Its totient is φ = 78422904.

The previous prime is 91879439. The next prime is 91879493. The reversal of 91879487 is 78497819.

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

It is not a de Polignac number, because 91879487 - 2²⁴ = 75102271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91879427) 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, 25787 + ... + 29132.

It is an arithmetic number, because the mean of its divisors is an integer number (13180800).

Almost surely, 2^91879487 is an apocalyptic number.

91879487 is a deficient number, since it is larger than the sum of its proper divisors (13566913).

91879487 is a wasteful number, since it uses less digits than its factorization.

91879487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55165.

The product of its digits is 1016064, while the sum is 53.

The square root of 91879487 is about 9585.3788135890. The cubic root of 91879487 is about 451.2385419241.

The spelling of 91879487 in words is "ninety-one million, eight hundred seventy-nine thousand, four hundred eighty-seven".