15728813 has 2 divisors, whose sum is σ = 15728814. Its totient is φ = 15728812.

The previous prime is 15728773. The next prime is 15728819. The reversal of 15728813 is 31882751.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14235529 + 1493284 = 3773^2 + 1222^2 .

It is a cyclic number.

It is not a de Polignac number, because 15728813 - 2¹² = 15724717 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (15728819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7864406 + 7864407.

It is an arithmetic number, because the mean of its divisors is an integer number (7864407).

Almost surely, 2^15728813 is an apocalyptic number.

It is an amenable number.

15728813 is a deficient number, since it is larger than the sum of its proper divisors (1).

15728813 is an equidigital number, since it uses as much as digits as its factorization.

15728813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13440, while the sum is 35.

The square root of 15728813 is about 3965.9567572025. The cubic root of 15728813 is about 250.5524476405.

The spelling of 15728813 in words is "fifteen million, seven hundred twenty-eight thousand, eight hundred thirteen".