999374447808 has 504 divisors, whose sum is σ = 3366763156224. Its totient is φ = 280975564800.

The previous prime is 999374447801. The next prime is 999374447833. The reversal of 999374447808 is 808744473999.

999374447808 is a `hidden beast` number, since 99 + 93 + 7 + 4 + 447 + 8 + 0 + 8 = 666.

It is a Smith number, since the sum of its digits (72) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (999374447801) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 130004541 + ... + 130012227.

Almost surely, 2^999374447808 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 999374447808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1683381578112).

999374447808 is an abundant number, since it is smaller than the sum of its proper divisors (2367388708416).

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

999374447808 is a wasteful number, since it uses less digits than its factorization.

999374447808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7821 (or 7791 counting only the distinct ones).

The product of its (nonzero) digits is 438939648, while the sum is 72.

The spelling of 999374447808 in words is "nine hundred ninety-nine billion, three hundred seventy-four million, four hundred forty-seven thousand, eight hundred eight".