91698816 has 128 divisors (see below), whose sum is σ = 281568960. Its totient is φ = 26132480.

The previous prime is 91698811. The next prime is 91698881. The reversal of 91698816 is 61889619.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (91698811) 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, 71170 + ... + 72446.

Almost surely, 2^91698816 is an apocalyptic number.

91698816 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91698816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140784480).

91698816 is an abundant number, since it is smaller than the sum of its proper divisors (189870144).

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

91698816 is a wasteful number, since it uses less digits than its factorization.

91698816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1322 (or 1310 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 91698816 is about 9575.9498745555. The cubic root of 91698816 is about 450.9425773699.

The spelling of 91698816 in words is "ninety-one million, six hundred ninety-eight thousand, eight hundred sixteen".