999090725000 has 96 divisors (see below), whose sum is σ = 2346575200200. Its totient is φ = 398764800000.

The previous prime is 999090724997. The next prime is 999090725047. The reversal of 999090725000 is 527090999.

It can be written as a sum of positive squares in 12 ways, for example, as 796981136644 + 202109588356 = 892738^2 + 449566^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is a self number, because there is not a number n which added to its sum of digits gives 999090725000.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11481656 + ... + 11568344.

Almost surely, 2^999090725000 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 999090725000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1173287600100).

999090725000 is an abundant number, since it is smaller than the sum of its proper divisors (1347484475200).

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

999090725000 is an equidigital number, since it uses as much as digits as its factorization.

999090725000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87181 (or 87157 counting only the distinct ones).

The product of its (nonzero) digits is 459270, while the sum is 50.

The spelling of 999090725000 in words is "nine hundred ninety-nine billion, ninety million, seven hundred twenty-five thousand".