28518529 has 4 divisors (see below), whose sum is σ = 30712276. Its totient is φ = 26324784.

The previous prime is 28518521. The next prime is 28518533. The reversal of 28518529 is 92581582.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9290304 + 19228225 = 3048^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 28518529 - 2³ = 28518521 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28518491 and 28518500.

It is not an unprimeable number, because it can be changed into a prime (28518521) 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, 1096854 + ... + 1096879.

It is an arithmetic number, because the mean of its divisors is an integer number (7678069).

Almost surely, 2^28518529 is an apocalyptic number.

It is an amenable number.

28518529 is a deficient number, since it is larger than the sum of its proper divisors (2193747).

28518529 is a wasteful number, since it uses less digits than its factorization.

28518529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193746.

The product of its digits is 57600, while the sum is 40.

The square root of 28518529 is about 5340.2742438942. The cubic root of 28518529 is about 305.5219192407.

The spelling of 28518529 in words is "twenty-eight million, five hundred eighteen thousand, five hundred twenty-nine".