91878685 has 8 divisors (see below), whose sum is σ = 110352600. Its totient is φ = 73437504.

The previous prime is 91878679. The next prime is 91878697. The reversal of 91878685 is 58687819.

It can be written as a sum of positive squares in 4 ways, for example, as 1666681 + 90212004 = 1291^2 + 9498^2 .

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 91878685 - 2¹⁷ = 91747613 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 1510 + ... + 13639.

It is an arithmetic number, because the mean of its divisors is an integer number (13794075).

Almost surely, 2^91878685 is an apocalyptic number.

It is an amenable number.

91878685 is a deficient number, since it is larger than the sum of its proper divisors (18473915).

91878685 is a wasteful number, since it uses less digits than its factorization.

91878685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16367.

The product of its digits is 967680, while the sum is 52.

The square root of 91878685 is about 9585.3369789486. The cubic root of 91878685 is about 451.2372289928.

The spelling of 91878685 in words is "ninety-one million, eight hundred seventy-eight thousand, six hundred eighty-five".