91814384 has 40 divisors (see below), whose sum is σ = 190464000. Its totient is φ = 42745536.

The previous prime is 91814383. The next prime is 91814389. The reversal of 91814384 is 48341819.

It is a super-2 number, since 2×91814384² = 16859762218598912, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91814381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15377 + ... + 20495.

It is an arithmetic number, because the mean of its divisors is an integer number (4761600).

Almost surely, 2^91814384 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91814384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (95232000).

91814384 is an abundant number, since it is smaller than the sum of its proper divisors (98649616).

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

91814384 is a wasteful number, since it uses less digits than its factorization.

91814384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5205 (or 5199 counting only the distinct ones).

The product of its digits is 27648, while the sum is 38.

The square root of 91814384 is about 9581.9822583847. The cubic root of 91814384 is about 451.1319387890.

The spelling of 91814384 in words is "ninety-one million, eight hundred fourteen thousand, three hundred eighty-four".