999248640 has 288 divisors, whose sum is σ = 3536250816. Its totient is φ = 238878720.

The previous prime is 999248633. The next prime is 999248641. The reversal of 999248640 is 46842999.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (999248641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1846770 + ... + 1847310.

Almost surely, 2^999248640 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 999248640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1768125408).

999248640 is an abundant number, since it is smaller than the sum of its proper divisors (2537002176).

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

999248640 is a wasteful number, since it uses less digits than its factorization.

999248640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The square root of 999248640 is about 31610.8943245837. The cubic root of 999248640 is about 999.7494839136.

The spelling of 999248640 in words is "nine hundred ninety-nine million, two hundred forty-eight thousand, six hundred forty".