91398888 has 64 divisors (see below), whose sum is σ = 290160000. Its totient is φ = 26113536.

The previous prime is 91398883. The next prime is 91398907. The reversal of 91398888 is 88889319.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (91398883) 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 15 ways as a sum of consecutive naturals, for example, 28713 + ... + 31736.

It is an arithmetic number, because the mean of its divisors is an integer number (4533750).

Almost surely, 2^91398888 is an apocalyptic number.

It is an amenable number.

91398888 is an abundant number, since it is smaller than the sum of its proper divisors (198761112).

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

91398888 is a wasteful number, since it uses less digits than its factorization.

91398888 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60471 (or 60461 counting only the distinct ones).

The product of its digits is 995328, while the sum is 54.

The square root of 91398888 is about 9560.2765650372. The cubic root of 91398888 is about 450.4503935067.

The spelling of 91398888 in words is "ninety-one million, three hundred ninety-eight thousand, eight hundred eighty-eight".