91816378 has 16 divisors (see below), whose sum is σ = 142702560. Its totient is φ = 44254000.

The previous prime is 91816369. The next prime is 91816393. The reversal of 91816378 is 87361819.

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 in 7 ways as a sum of consecutive naturals, for example, 62553 + ... + 64003.

It is an arithmetic number, because the mean of its divisors is an integer number (8918910).

Almost surely, 2^91816378 is an apocalyptic number.

91816378 is a deficient number, since it is larger than the sum of its proper divisors (50886182).

91816378 is a wasteful number, since it uses less digits than its factorization.

91816378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573.

The product of its digits is 72576, while the sum is 43.

The square root of 91816378 is about 9582.0863072715. The cubic root of 91816378 is about 451.1352046193.

The spelling of 91816378 in words is "ninety-one million, eight hundred sixteen thousand, three hundred seventy-eight".