13028749 has 8 divisors (see below), whose sum is σ = 13939128. Its totient is φ = 12134400.

The previous prime is 13028731. The next prime is 13028761. The reversal of 13028749 is 94782031.

It can be written as a sum of positive squares in 4 ways, for example, as 4284900 + 8743849 = 2070^2 + 2957^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13028749 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 (13028789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2302 + ... + 5599.

It is an arithmetic number, because the mean of its divisors is an integer number (1742391).

Almost surely, 2^13028749 is an apocalyptic number.

It is an amenable number.

13028749 is a deficient number, since it is larger than the sum of its proper divisors (910379).

13028749 is an equidigital number, since it uses as much as digits as its factorization.

13028749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8015.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 13028749 is about 3609.5358427366. The cubic root of 13028749 is about 235.3066706991.

The spelling of 13028749 in words is "thirteen million, twenty-eight thousand, seven hundred forty-nine".