91878641 has 8 divisors (see below), whose sum is σ = 96467520. Its totient is φ = 87384528.

The previous prime is 91878613. The next prime is 91878667. The reversal of 91878641 is 14687819.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91878641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91878592 and 91878601.

It is not an unprimeable number, because it can be changed into a prime (91878671) 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, 21701 + ... + 25586.

It is an arithmetic number, because the mean of its divisors is an integer number (12058440).

Almost surely, 2^91878641 is an apocalyptic number.

It is an amenable number.

91878641 is a deficient number, since it is larger than the sum of its proper divisors (4588879).

91878641 is a wasteful number, since it uses less digits than its factorization.

91878641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47383.

The product of its digits is 96768, while the sum is 44.

The square root of 91878641 is about 9585.3346837760. The cubic root of 91878641 is about 451.2371569614.

The spelling of 91878641 in words is "ninety-one million, eight hundred seventy-eight thousand, six hundred forty-one".