28752539 has 4 divisors (see below), whose sum is σ = 28766760. Its totient is φ = 28738320.

The previous prime is 28752523. The next prime is 28752541. The reversal of 28752539 is 93525782.

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

It is a cyclic number.

It is not a de Polignac number, because 28752539 - 2⁴ = 28752523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28752496 and 28752505.

It is not an unprimeable number, because it can be changed into a prime (28752569) 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, 3449 + ... + 8330.

It is an arithmetic number, because the mean of its divisors is an integer number (7191690).

Almost surely, 2^28752539 is an apocalyptic number.

28752539 is a deficient number, since it is larger than the sum of its proper divisors (14221).

28752539 is a wasteful number, since it uses less digits than its factorization.

28752539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14220.

The product of its digits is 151200, while the sum is 41.

The square root of 28752539 is about 5362.1394051255. The cubic root of 28752539 is about 306.3553016202.

The spelling of 28752539 in words is "twenty-eight million, seven hundred fifty-two thousand, five hundred thirty-nine".