91841904 has 240 divisors, whose sum is σ = 332478720. Its totient is φ = 23760000.

The previous prime is 91841903. The next prime is 91841947. The reversal of 91841904 is 40914819.

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

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91841903) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 365779 + ... + 366029.

It is an arithmetic number, because the mean of its divisors is an integer number (1385328).

Almost surely, 2^91841904 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 91841904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (166239360).

91841904 is an abundant number, since it is smaller than the sum of its proper divisors (240636816).

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

91841904 is a wasteful number, since it uses less digits than its factorization.

91841904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 91841904 is about 9583.4181793346. The cubic root of 91841904 is about 451.1770076559.

The spelling of 91841904 in words is "ninety-one million, eight hundred forty-one thousand, nine hundred four".