91986738 has 8 divisors (see below), whose sum is σ = 183973488. Its totient is φ = 30662244.

The previous prime is 91986737. The next prime is 91986767. The reversal of 91986738 is 83768919.

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

91986738 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (91986737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7665556 + ... + 7665567.

It is an arithmetic number, because the mean of its divisors is an integer number (22996686).

Almost surely, 2^91986738 is an apocalyptic number.

91986738 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91986738 is a wasteful number, since it uses less digits than its factorization.

91986738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15331128.

The product of its digits is 653184, while the sum is 51.

The square root of 91986738 is about 9590.9716921697. The cubic root of 91986738 is about 451.4140506904.

The spelling of 91986738 in words is "ninety-one million, nine hundred eighty-six thousand, seven hundred thirty-eight".