28959813 has 6 divisors (see below), whose sum is σ = 41830854. Its totient is φ = 19306536.

The previous prime is 28959787. The next prime is 28959839. The reversal of 28959813 is 31895982.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28959787) and next prime (28959839).

It can be written as a sum of positive squares in only one way, i.e., 28547649 + 412164 = 5343^2 + 642^2 .

It is not a de Polignac number, because 28959813 - 2¹⁷ = 28828741 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28959913) 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 5 ways as a sum of consecutive naturals, for example, 1608870 + ... + 1608887.

It is an arithmetic number, because the mean of its divisors is an integer number (6971809).

Almost surely, 2^28959813 is an apocalyptic number.

It is an amenable number.

28959813 is a deficient number, since it is larger than the sum of its proper divisors (12871041).

28959813 is a wasteful number, since it uses less digits than its factorization.

28959813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3217763 (or 3217760 counting only the distinct ones).

The product of its digits is 155520, while the sum is 45.

The square root of 28959813 is about 5381.4322443008. The cubic root of 28959813 is about 307.0897006466.

The spelling of 28959813 in words is "twenty-eight million, nine hundred fifty-nine thousand, eight hundred thirteen".