91408879 has 8 divisors (see below), whose sum is σ = 92882592. Its totient is φ = 89940480.

The previous prime is 91408871. The next prime is 91408883. The reversal of 91408879 is 97880419.

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 91408879 - 2³ = 91408871 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 (91408871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46827 + ... + 48739.

It is an arithmetic number, because the mean of its divisors is an integer number (11610324).

Almost surely, 2^91408879 is an apocalyptic number.

91408879 is a deficient number, since it is larger than the sum of its proper divisors (1473713).

91408879 is a wasteful number, since it uses less digits than its factorization.

91408879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2657.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 91408879 is about 9560.7990774830. The cubic root of 91408879 is about 450.4668061276.

The spelling of 91408879 in words is "ninety-one million, four hundred eight thousand, eight hundred seventy-nine".