999724032 has 220 divisors, whose sum is σ = 3165439860. Its totient is φ = 313196544.

The previous prime is 999724031. The next prime is 999724051. The reversal of 999724032 is 230427999.

It can be written as a sum of positive squares in 2 ways, for example, as 442008576 + 557715456 = 21024^2 + 23616^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999724031) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1409694 + ... + 1410402.

It is an arithmetic number, because the mean of its divisors is an integer number (14388363).

Almost surely, 2^999724032 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 999724032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1582719930).

999724032 is an abundant number, since it is smaller than the sum of its proper divisors (2165715828).

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

999724032 is a wasteful number, since it uses less digits than its factorization.

999724032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758 (or 731 counting only the distinct ones).

The product of its (nonzero) digits is 244944, while the sum is 45.

The square root of 999724032 is about 31618.4128633934. The cubic root of 999724032 is about 999.9080022033.

The spelling of 999724032 in words is "nine hundred ninety-nine million, seven hundred twenty-four thousand, thirty-two".