28725579 has 12 divisors (see below), whose sum is σ = 42614416. Its totient is φ = 18632592.

The previous prime is 28725577. The next prime is 28725581. The reversal of 28725579 is 97552782.

It is a happy number.

28725579 is a `hidden beast` number, since 2 + 8 + 72 + 5 + 579 = 666.

It is an interprime number because it is at equal distance from previous prime (28725577) and next prime (28725581).

It is not a de Polignac number, because 28725579 - 2¹ = 28725577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28725577) 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 11 ways as a sum of consecutive naturals, for example, 42799 + ... + 43464.

Almost surely, 2^28725579 is an apocalyptic number.

28725579 is a deficient number, since it is larger than the sum of its proper divisors (13888837).

28725579 is a wasteful number, since it uses less digits than its factorization.

28725579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86306 (or 86303 counting only the distinct ones).

The product of its digits is 352800, while the sum is 45.

The square root of 28725579 is about 5359.6248935910. The cubic root of 28725579 is about 306.2595196819.

The spelling of 28725579 in words is "twenty-eight million, seven hundred twenty-five thousand, five hundred seventy-nine".