13628749 has 4 divisors (see below), whose sum is σ = 13647420. Its totient is φ = 13610080.

The previous prime is 13628743. The next prime is 13628759. The reversal of 13628749 is 94782631.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1946025 + 11682724 = 1395^2 + 3418^2 .

It is a cyclic number.

It is not a de Polignac number, because 13628749 - 2⁷ = 13628621 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13628743) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8194 + ... + 9715.

It is an arithmetic number, because the mean of its divisors is an integer number (3411855).

Almost surely, 2^13628749 is an apocalyptic number.

It is an amenable number.

13628749 is a deficient number, since it is larger than the sum of its proper divisors (18671).

13628749 is an equidigital number, since it uses as much as digits as its factorization.

13628749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18670.

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

The square root of 13628749 is about 3691.7135587692. The cubic root of 13628749 is about 238.8647133839.

The spelling of 13628749 in words is "thirteen million, six hundred twenty-eight thousand, seven hundred forty-nine".