16728591 has 16 divisors (see below), whose sum is σ = 24900480. Its totient is φ = 9901920.

The previous prime is 16728589. The next prime is 16728599. The reversal of 16728591 is 19582761.

It is not a de Polignac number, because 16728591 - 2¹ = 16728589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16728599) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4476 + ... + 7313.

It is an arithmetic number, because the mean of its divisors is an integer number (1556280).

Almost surely, 2^16728591 is an apocalyptic number.

16728591 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

16728591 is a deficient number, since it is larger than the sum of its proper divisors (8171889).

16728591 is a wasteful number, since it uses less digits than its factorization.

16728591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11846.

The product of its digits is 30240, while the sum is 39.

The square root of 16728591 is about 4090.0600240094. The cubic root of 16728591 is about 255.7524411417.

The spelling of 16728591 in words is "sixteen million, seven hundred twenty-eight thousand, five hundred ninety-one".