999872636628 has 96 divisors (see below), whose sum is σ = 2470706380800. Its totient is φ = 313841983104.

The previous prime is 999872636627. The next prime is 999872636677. The reversal of 999872636628 is 826636278999.

999872636628 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 999872636628.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999872636621) 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, 25566393 + ... + 25605471.

It is an arithmetic number, because the mean of its divisors is an integer number (25736524800).

Almost surely, 2^999872636628 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 999872636628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1235353190400).

999872636628 is an abundant number, since it is smaller than the sum of its proper divisors (1470833744172).

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

999872636628 is a wasteful number, since it uses less digits than its factorization.

999872636628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39781 (or 39779 counting only the distinct ones).

The product of its digits is 846526464, while the sum is 75.

The spelling of 999872636628 in words is "nine hundred ninety-nine billion, eight hundred seventy-two million, six hundred thirty-six thousand, six hundred twenty-eight".