28828513 has 12 divisors (see below), whose sum is σ = 34443732. Its totient is φ = 24040800.

The previous prime is 28828511. The next prime is 28828517. The reversal of 28828513 is 31582882.

It can be written as a sum of positive squares in 2 ways, for example, as 27636049 + 1192464 = 5257^2 + 1092^2 .

It is not a de Polignac number, because 28828513 - 2¹ = 28828511 is a prime.

It is a super-3 number, since 3×28828513³ (a number of 23 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28828511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6138 + ... + 9763.

It is an arithmetic number, because the mean of its divisors is an integer number (2870311).

Almost surely, 2^28828513 is an apocalyptic number.

It is an amenable number.

28828513 is a deficient number, since it is larger than the sum of its proper divisors (5615219).

28828513 is a wasteful number, since it uses less digits than its factorization.

28828513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15952 (or 15945 counting only the distinct ones).

The product of its digits is 30720, while the sum is 37.

The square root of 28828513 is about 5369.2190307344. The cubic root of 28828513 is about 306.6248959858.

The spelling of 28828513 in words is "twenty-eight million, eight hundred twenty-eight thousand, five hundred thirteen".