16409728 has 16 divisors (see below), whose sum is σ = 32691510. Its totient is φ = 8204800.

The previous prime is 16409719. The next prime is 16409753. The reversal of 16409728 is 82790461.

It can be written as a sum of positive squares in only one way, i.e., 11778624 + 4631104 = 3432^2 + 2152^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63973 + ... + 64228.

Almost surely, 2^16409728 is an apocalyptic number.

It is an amenable number.

16409728 is a deficient number, since it is larger than the sum of its proper divisors (16281782).

16409728 is an equidigital number, since it uses as much as digits as its factorization.

16409728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128215 (or 128203 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 16409728 is about 4050.8922473944. The cubic root of 16409728 is about 254.1170436253.

The spelling of 16409728 in words is "sixteen million, four hundred nine thousand, seven hundred twenty-eight".