28292513 has 4 divisors (see below), whose sum is σ = 28826388. Its totient is φ = 27758640.

The previous prime is 28292483. The next prime is 28292519. The reversal of 28292513 is 31529282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31529282 = 2 ⋅15764641.

It can be written as a sum of positive squares in 2 ways, for example, as 21977344 + 6315169 = 4688^2 + 2513^2 .

It is a cyclic number.

It is not a de Polignac number, because 28292513 - 2¹⁰ = 28291489 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 28292513.

It is not an unprimeable number, because it can be changed into a prime (28292519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 266858 + ... + 266963.

It is an arithmetic number, because the mean of its divisors is an integer number (7206597).

Almost surely, 2^28292513 is an apocalyptic number.

It is an amenable number.

28292513 is a deficient number, since it is larger than the sum of its proper divisors (533875).

28292513 is an equidigital number, since it uses as much as digits as its factorization.

28292513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533874.

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

The square root of 28292513 is about 5319.0706895096. The cubic root of 28292513 is about 304.7126667777.

The spelling of 28292513 in words is "twenty-eight million, two hundred ninety-two thousand, five hundred thirteen".