28575539 has 4 divisors (see below), whose sum is σ = 28592256. Its totient is φ = 28558824.

The previous prime is 28575517. The next prime is 28575541. The reversal of 28575539 is 93557582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93557582 = 2 ⋅46778791.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28575539 is a prime.

It is a super-2 number, since 2×28575539² = 1633122858281042, which contains 22 as substring.

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 28575539.

It is not an unprimeable number, because it can be changed into a prime (28575509) 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, 5459 + ... + 9324.

It is an arithmetic number, because the mean of its divisors is an integer number (7148064).

Almost surely, 2^28575539 is an apocalyptic number.

28575539 is a deficient number, since it is larger than the sum of its proper divisors (16717).

28575539 is a wasteful number, since it uses less digits than its factorization.

28575539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16716.

The product of its digits is 378000, while the sum is 44.

The square root of 28575539 is about 5345.6093198063. The cubic root of 28575539 is about 305.7253683869.

The spelling of 28575539 in words is "twenty-eight million, five hundred seventy-five thousand, five hundred thirty-nine".