28520559 has 8 divisors (see below), whose sum is σ = 42252720. Its totient is φ = 19013688.

The previous prime is 28520551. The next prime is 28520561. The reversal of 28520559 is 95502582.

28520559 is a `hidden beast` number, since 2 + 85 + 20 + 559 = 666.

It is not a de Polignac number, because 28520559 - 2³ = 28520551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28520551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 528132 + ... + 528185.

It is an arithmetic number, because the mean of its divisors is an integer number (5281590).

Almost surely, 2^28520559 is an apocalyptic number.

28520559 is a deficient number, since it is larger than the sum of its proper divisors (13732161).

28520559 is a wasteful number, since it uses less digits than its factorization.

28520559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1056326 (or 1056320 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 28520559 is about 5340.4643056573. The cubic root of 28520559 is about 305.5291682680.

It can be divided in two parts, 2 and 8520559, that added together give a square (8520561 = 2919²).

The spelling of 28520559 in words is "twenty-eight million, five hundred twenty thousand, five hundred fifty-nine".