999666432 has 54 divisors (see below), whose sum is σ = 2882291412. Its totient is φ = 333221376.

The previous prime is 999666431. The next prime is 999666461. The reversal of 999666432 is 234666999.

It is a super-2 number, since 2×999666432² = 1998665950535221248, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999666431) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214638 + ... + 219245.

Almost surely, 2^999666432 is an apocalyptic number.

It is an amenable number.

999666432 is an abundant number, since it is smaller than the sum of its proper divisors (1882624980).

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

999666432 is a wasteful number, since it uses less digits than its factorization.

999666432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433905 (or 433888 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The square root of 999666432 is about 31617.5019886138. The cubic root of 999666432 is about 999.8887983013. Note that the first 3 decimals are identical.

The spelling of 999666432 in words is "nine hundred ninety-nine million, six hundred sixty-six thousand, four hundred thirty-two".