91198008 has 128 divisors (see below), whose sum is σ = 279417600. Its totient is φ = 27331200.

The previous prime is 91197991. The next prime is 91198021. The reversal of 91198008 is 80089119.

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 an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 311110 + ... + 311402.

It is an arithmetic number, because the mean of its divisors is an integer number (2182950).

Almost surely, 2^91198008 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 91198008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139708800).

91198008 is an abundant number, since it is smaller than the sum of its proper divisors (188219592).

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

91198008 is a wasteful number, since it uses less digits than its factorization.

91198008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 440 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 36.

The square root of 91198008 is about 9549.7648138580. The cubic root of 91198008 is about 450.1201456972.

Subtracting from 91198008 its reverse (80089119), we obtain a square (11108889 = 3333²).

The spelling of 91198008 in words is "ninety-one million, one hundred ninety-eight thousand, eight".