999317788420 has 48 divisors (see below), whose sum is σ = 2447308886400. Its totient is φ = 342623239392.

The previous prime is 999317788411. The next prime is 999317788487. The reversal of 999317788420 is 24887713999.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72829714 + ... + 72843433.

It is an arithmetic number, because the mean of its divisors is an integer number (50985601800).

Almost surely, 2^999317788420 is an apocalyptic number.

It is an amenable number.

999317788420 is an abundant number, since it is smaller than the sum of its proper divisors (1447991097980).

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

999317788420 is a wasteful number, since it uses less digits than its factorization.

999317788420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145673177 (or 145673161 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 67.

The spelling of 999317788420 in words is "nine hundred ninety-nine billion, three hundred seventeen million, seven hundred eighty-eight thousand, four hundred twenty".