91821368 has 16 divisors (see below), whose sum is σ = 172475160. Its totient is φ = 45828000.

The previous prime is 91821361. The next prime is 91821397. The reversal of 91821368 is 86312819.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91821361) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 5483 + ... + 14618.

Almost surely, 2^91821368 is an apocalyptic number.

It is an amenable number.

91821368 is a deficient number, since it is larger than the sum of its proper divisors (80653792).

91821368 is a wasteful number, since it uses less digits than its factorization.

91821368 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20678 (or 20674 counting only the distinct ones).

The product of its digits is 20736, while the sum is 38.

The square root of 91821368 is about 9582.3466854419. The cubic root of 91821368 is about 451.1433771768.

The spelling of 91821368 in words is "ninety-one million, eight hundred twenty-one thousand, three hundred sixty-eight".