999887640999936 has 768 divisors, whose sum is σ = 3004350951813120. Its totient is φ = 293629297950720.

The previous prime is 999887640999917. The next prime is 999887640999937. The reversal of 999887640999936 is 639999046788999.

It is a tau number, because it is divible by the number of its divisors (768).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999887640999937) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 125978028160 + ... + 125978036096.

It is an arithmetic number, because the mean of its divisors is an integer number (3911915301840).

Almost surely, 2^{999887640999936} is an apocalyptic number.

999887640999936 is a gapful number since it is divisible by the number (96) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 999887640999936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1502175475906560).

999887640999936 is an abundant number, since it is smaller than the sum of its proper divisors (2004463310813184).

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

999887640999936 is a wasteful number, since it uses less digits than its factorization.

999887640999936 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8702 (or 8682 counting only the distinct ones).

The product of its (nonzero) digits is 925676688384, while the sum is 105.

The spelling of 999887640999936 in words is "nine hundred ninety-nine trillion, eight hundred eighty-seven billion, six hundred forty million, nine hundred ninety-nine thousand, nine hundred thirty-six".