16728731 has 8 divisors (see below), whose sum is σ = 17889984. Its totient is φ = 15587200.

The previous prime is 16728709. The next prime is 16728739. The reversal of 16728731 is 13782761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16728731 - 2⁶ = 16728667 is a prime.

It is a super-2 number, since 2×16728731² = 559700881740722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16728691 and 16728700.

It is not an unprimeable number, because it can be changed into a prime (16728739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3155 + ... + 6588.

It is an arithmetic number, because the mean of its divisors is an integer number (2236248).

Almost surely, 2^16728731 is an apocalyptic number.

16728731 is a deficient number, since it is larger than the sum of its proper divisors (1161253).

16728731 is a wasteful number, since it uses less digits than its factorization.

16728731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9861.

The product of its digits is 14112, while the sum is 35.

The square root of 16728731 is about 4090.0771386369. The cubic root of 16728731 is about 255.7531545958.

Multiplying 16728731 by its sum of digits (35), we get a palindrome (585505585).

The spelling of 16728731 in words is "sixteen million, seven hundred twenty-eight thousand, seven hundred thirty-one".