91918806 has 48 divisors (see below), whose sum is σ = 221246640. Its totient is φ = 25354560.

The previous prime is 91918747. The next prime is 91918817. The reversal of 91918806 is 60881919.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3136 + ... + 13916.

It is an arithmetic number, because the mean of its divisors is an integer number (4609305).

Almost surely, 2^91918806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91918806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110623320).

91918806 is an abundant number, since it is smaller than the sum of its proper divisors (129327834).

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

91918806 is a wasteful number, since it uses less digits than its factorization.

91918806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10829 (or 10822 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 91918806 is about 9587.4295825315. The cubic root of 91918806 is about 451.3029005694.

The spelling of 91918806 in words is "ninety-one million, nine hundred eighteen thousand, eight hundred six".