91866402 has 48 divisors (see below), whose sum is σ = 211622112. Its totient is φ = 28702080.

The previous prime is 91866391. The next prime is 91866407. The reversal of 91866402 is 20466819.

91866402 is a `hidden beast` number, since 9 + 1 + 8 + 6 + 640 + 2 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (91866407) 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 23 ways as a sum of consecutive naturals, for example, 100833 + ... + 101739.

It is an arithmetic number, because the mean of its divisors is an integer number (4408794).

Almost surely, 2^91866402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91866402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105811056).

91866402 is an abundant number, since it is smaller than the sum of its proper divisors (119755710).

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

91866402 is a wasteful number, since it uses less digits than its factorization.

91866402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1263 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 91866402 is about 9584.6962393182. The cubic root of 91866402 is about 451.2171198895.

The spelling of 91866402 in words is "ninety-one million, eight hundred sixty-six thousand, four hundred two".