999688922280 has 128 divisors (see below), whose sum is σ = 3332749622400. Its totient is φ = 266547456000.

The previous prime is 999688922191. The next prime is 999688922383. The reversal of 999688922280 is 82229886999.

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

It is a junction number, because it is equal to n+sod(n) for n = 999688922199 and 999688922208.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8409255 + ... + 8527305.

It is an arithmetic number, because the mean of its divisors is an integer number (26037106425).

Almost surely, 2^999688922280 is an apocalyptic number.

999688922280 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

999688922280 is an abundant number, since it is smaller than the sum of its proper divisors (2333060700120).

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

999688922280 is a wasteful number, since it uses less digits than its factorization.

999688922280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125912 (or 125902 counting only the distinct ones).

The product of its (nonzero) digits is 161243136, while the sum is 72.

The spelling of 999688922280 in words is "nine hundred ninety-nine billion, six hundred eighty-eight million, nine hundred twenty-two thousand, two hundred eighty".