91878656 has 18 divisors (see below), whose sum is σ = 183398922. Its totient is φ = 45939200.

The previous prime is 91878613. The next prime is 91878667. The reversal of 91878656 is 65687819.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 91853056 + 25600 = 9584^2 + 160^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 179195 + ... + 179706.

It is an arithmetic number, because the mean of its divisors is an integer number (10188829).

Almost surely, 2^91878656 is an apocalyptic number.

It is an amenable number.

91878656 is a deficient number, since it is larger than the sum of its proper divisors (91520266).

91878656 is an equidigital number, since it uses as much as digits as its factorization.

91878656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 358917 (or 358903 counting only the distinct ones).

The product of its digits is 725760, while the sum is 50.

The square root of 91878656 is about 9585.3354662213. The cubic root of 91878656 is about 451.2371815175.

The spelling of 91878656 in words is "ninety-one million, eight hundred seventy-eight thousand, six hundred fifty-six".