91399104 has 112 divisors (see below), whose sum is σ = 272430240. Its totient is φ = 30419712.

The previous prime is 91399103. The next prime is 91399111. The reversal of 91399104 is 40199319.

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 (91399103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139642 + ... + 140294.

Almost surely, 2^91399104 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 91399104, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136215120).

91399104 is an abundant number, since it is smaller than the sum of its proper divisors (181031136).

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

91399104 is an frugal number, since it uses more digits than its factorization.

91399104 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 686 (or 658 counting only the distinct ones).

The product of its (nonzero) digits is 8748, while the sum is 36.

The square root of 91399104 is about 9560.2878617749. The cubic root of 91399104 is about 450.4507483513.

The spelling of 91399104 in words is "ninety-one million, three hundred ninety-nine thousand, one hundred four".