999990000024 has 128 divisors (see below), whose sum is σ = 2629670400000. Its totient is φ = 316278509184.

The previous prime is 999990000017. The next prime is 999990000067. The reversal of 999990000024 is 420000099999.

It is a Cunningham number, because it is equal to 999995²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 45988947 + ... + 46010685.

It is an arithmetic number, because the mean of its divisors is an integer number (20544300000).

Almost surely, 2^999990000024 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 999990000024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1314835200000).

999990000024 is an abundant number, since it is smaller than the sum of its proper divisors (1629680399976).

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

999990000024 is a wasteful number, since it uses less digits than its factorization.

999990000024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22437 (or 22433 counting only the distinct ones).

The product of its (nonzero) digits is 472392, while the sum is 51.

The spelling of 999990000024 in words is "nine hundred ninety-nine billion, nine hundred ninety million, twenty-four", and thus it is an aban number.