915666444 has 360 divisors, whose sum is σ = 3195236352. Its totient is φ = 222082560.

The previous prime is 915666431. The next prime is 915666509. The reversal of 915666444 is 444666519.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 915666444.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 119 ways as a sum of consecutive naturals, for example, 7209909 + ... + 7210035.

Almost surely, 2^915666444 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 915666444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1597618176).

915666444 is an abundant number, since it is smaller than the sum of its proper divisors (2279569908).

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

915666444 is a wasteful number, since it uses less digits than its factorization.

915666444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195 (or 167 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 915666444 is about 30259.9808988704. The cubic root of 915666444 is about 971.0593322894.

The spelling of 915666444 in words is "nine hundred fifteen million, six hundred sixty-six thousand, four hundred forty-four".