28749539 has 16 divisors (see below), whose sum is σ = 35759808. Its totient is φ = 22505472.

The previous prime is 28749529. The next prime is 28749541. The reversal of 28749539 is 93594782.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28749539 - 2⁸ = 28749283 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28749493 and 28749502.

It is not an unprimeable number, because it can be changed into a prime (28749529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7199 + ... + 10455.

It is an arithmetic number, because the mean of its divisors is an integer number (2234988).

Almost surely, 2^28749539 is an apocalyptic number.

28749539 is a deficient number, since it is larger than the sum of its proper divisors (7010269).

28749539 is a wasteful number, since it uses less digits than its factorization.

28749539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3374.

The product of its digits is 544320, while the sum is 47.

The square root of 28749539 is about 5361.8596587378. The cubic root of 28749539 is about 306.3446463540.

The spelling of 28749539 in words is "twenty-eight million, seven hundred forty-nine thousand, five hundred thirty-nine".