16505728 has 16 divisors (see below), whose sum is σ = 32882760. Its totient is φ = 8252800.

The previous prime is 16505719. The next prime is 16505747. The reversal of 16505728 is 82750561.

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

It is a junction number, because it is equal to n+sod(n) for n = 16505693 and 16505702.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64348 + ... + 64603.

Almost surely, 2^16505728 is an apocalyptic number.

It is an amenable number.

16505728 is a deficient number, since it is larger than the sum of its proper divisors (16377032).

16505728 is an equidigital number, since it uses as much as digits as its factorization.

16505728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128965 (or 128953 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 16505728 is about 4062.7242091976. The cubic root of 16505728 is about 254.6116246032.

The spelling of 16505728 in words is "sixteen million, five hundred five thousand, seven hundred twenty-eight".