91216398 has 96 divisors (see below), whose sum is σ = 230211072. Its totient is φ = 23587200.

The previous prime is 91216393. The next prime is 91216399. The reversal of 91216398 is 89361219.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91216393) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 503868 + ... + 504048.

It is an arithmetic number, because the mean of its divisors is an integer number (2398032).

Almost surely, 2^91216398 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91216398, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (115105536).

91216398 is an abundant number, since it is smaller than the sum of its proper divisors (138994674).

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

91216398 is a wasteful number, since it uses less digits than its factorization.

91216398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290 (or 277 counting only the distinct ones).

The product of its digits is 23328, while the sum is 39.

The square root of 91216398 is about 9550.7276162604. The cubic root of 91216398 is about 450.1503991107.

The spelling of 91216398 in words is "ninety-one million, two hundred sixteen thousand, three hundred ninety-eight".