28252913 has 6 divisors (see below), whose sum is σ = 30593574. Its totient is φ = 26079456.

The previous prime is 28252891. The next prime is 28252919. The reversal of 28252913 is 31925282.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 868624 + 27384289 = 932^2 + 5233^2 .

It is not a de Polignac number, because 28252913 - 2¹² = 28248817 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28252913.

It is not an unprimeable number, because it can be changed into a prime (28252919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 83420 + ... + 83757.

It is an arithmetic number, because the mean of its divisors is an integer number (5098929).

Almost surely, 2^28252913 is an apocalyptic number.

It is an amenable number.

28252913 is a deficient number, since it is larger than the sum of its proper divisors (2340661).

28252913 is a wasteful number, since it uses less digits than its factorization.

28252913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167203 (or 167190 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 28252913 is about 5315.3469312924. The cubic root of 28252913 is about 304.5704353244.

The spelling of 28252913 in words is "twenty-eight million, two hundred fifty-two thousand, nine hundred thirteen".