91644416 has 40 divisors (see below), whose sum is σ = 193899420. Its totient is φ = 43122688.

The previous prime is 91644403. The next prime is 91644431. The reversal of 91644416 is 61444619.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 82882816 + 8761600 = 9104^2 + 2960^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3440 + ... + 13968.

Almost surely, 2^91644416 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 91644416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96949710).

91644416 is an abundant number, since it is smaller than the sum of its proper divisors (102255004).

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

91644416 is a wasteful number, since it uses less digits than its factorization.

91644416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10564 (or 10548 counting only the distinct ones).

The product of its digits is 20736, while the sum is 35.

The square root of 91644416 is about 9573.1090038712. The cubic root of 91644416 is about 450.8533863643.

The spelling of 91644416 in words is "ninety-one million, six hundred forty-four thousand, four hundred sixteen".