999555072 has 152 divisors (see below), whose sum is σ = 2818566912. Its totient is φ = 314572800.

The previous prime is 999555043. The next prime is 999555083. The reversal of 999555072 is 270555999.

It is a super-2 number, since 2×999555072² = 1998220683921850368, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24379372 + ... + 24379412.

Almost surely, 2^999555072 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 999555072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1409283456).

999555072 is an abundant number, since it is smaller than the sum of its proper divisors (1819011840).

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

999555072 is an frugal number, since it uses more digits than its factorization.

999555072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 1275750, while the sum is 51.

The square root of 999555072 is about 31615.7408896265. The cubic root of 999555072 is about 999.8516686656.

The spelling of 999555072 in words is "nine hundred ninety-nine million, five hundred fifty-five thousand, seventy-two".