999264644 has 48 divisors (see below), whose sum is σ = 2146704000. Its totient is φ = 405705888.

The previous prime is 999264631. The next prime is 999264667. The reversal of 999264644 is 446462999.

It is a happy number.

999264644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6902 + ... + 45234.

It is an arithmetic number, because the mean of its divisors is an integer number (44723000).

Almost surely, 2^999264644 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 999264644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1073352000).

999264644 is an abundant number, since it is smaller than the sum of its proper divisors (1147439356).

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

999264644 is a wasteful number, since it uses less digits than its factorization.

999264644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38377 (or 38361 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 53.

The square root of 999264644 is about 31611.1474641463. The cubic root of 999264644 is about 999.7548212256.

The spelling of 999264644 in words is "nine hundred ninety-nine million, two hundred sixty-four thousand, six hundred forty-four".