16643432 has 16 divisors (see below), whose sum is σ = 33607140. Its totient is φ = 7681536.

The previous prime is 16643401. The next prime is 16643447. The reversal of 16643432 is 23434661.

It can be written as a sum of positive squares in 2 ways, for example, as 12292036 + 4351396 = 3506^2 + 2086^2 .

16643432 is a modest number, since divided by 3432 gives 1664 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 16643395 and 16643404.

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, 79913 + ... + 80120.

Almost surely, 2^16643432 is an apocalyptic number.

It is an amenable number.

16643432 is an abundant number, since it is smaller than the sum of its proper divisors (16963708).

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

16643432 is a wasteful number, since it uses less digits than its factorization.

16643432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160052 (or 160048 counting only the distinct ones).

The product of its digits is 10368, while the sum is 29.

The square root of 16643432 is about 4079.6362582956. The cubic root of 16643432 is about 255.3177226347.

The spelling of 16643432 in words is "sixteen million, six hundred forty-three thousand, four hundred thirty-two".