999371392680 has 128 divisors (see below), whose sum is σ = 3080002423680. Its totient is φ = 259224099840.

The previous prime is 999371392673. The next prime is 999371392681. The reversal of 999371392680 is 86293173999.

It is a happy number.

999371392680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (999371392681) 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, 16935787 + ... + 16994693.

It is an arithmetic number, because the mean of its divisors is an integer number (24062518935).

Almost surely, 2^999371392680 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 999371392680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1540001211840).

999371392680 is an abundant number, since it is smaller than the sum of its proper divisors (2080631031000).

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

999371392680 is a wasteful number, since it uses less digits than its factorization.

999371392680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62779 (or 62775 counting only the distinct ones).

The product of its (nonzero) digits is 39680928, while the sum is 66.

The spelling of 999371392680 in words is "nine hundred ninety-nine billion, three hundred seventy-one million, three hundred ninety-two thousand, six hundred eighty".