999620608 has 68 divisors (see below), whose sum is σ = 2285878240. Its totient is φ = 428212224.

The previous prime is 999620563. The next prime is 999620623. The reversal of 999620608 is 806026999.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 457663 + ... + 459841.

Almost surely, 2^999620608 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 999620608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1142939120).

999620608 is an abundant number, since it is smaller than the sum of its proper divisors (1286257632).

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

999620608 is an frugal number, since it uses more digits than its factorization.

999620608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2218 (or 2188 counting only the distinct ones).

The product of its (nonzero) digits is 419904, while the sum is 49.

The square root of 999620608 is about 31616.7773183796. Note that the first 3 decimals coincide. The cubic root of 999620608 is about 999.8735200035.

The spelling of 999620608 in words is "nine hundred ninety-nine million, six hundred twenty thousand, six hundred eight".