16728349 has 4 divisors (see below), whose sum is σ = 18249120. Its totient is φ = 15207580.

The previous prime is 16728347. The next prime is 16728367. The reversal of 16728349 is 94382761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94382761 = 11 ⋅8580251.

It is a cyclic number.

It is not a de Polignac number, because 16728349 - 2¹ = 16728347 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16728347) by changing a digit.

It is an upside-down number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 760369 + ... + 760390.

It is an arithmetic number, because the mean of its divisors is an integer number (4562280).

Almost surely, 2^16728349 is an apocalyptic number.

It is an amenable number.

16728349 is a deficient number, since it is larger than the sum of its proper divisors (1520771).

16728349 is a wasteful number, since it uses less digits than its factorization.

16728349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1520770.

The product of its digits is 72576, while the sum is 40.

The square root of 16728349 is about 4090.0304399845. The cubic root of 16728349 is about 255.7512078761.

The spelling of 16728349 in words is "sixteen million, seven hundred twenty-eight thousand, three hundred forty-nine".