28424539 has 16 divisors (see below), whose sum is σ = 33596640. Its totient is φ = 23708160.

The previous prime is 28424533. The next prime is 28424579. The reversal of 28424539 is 93542482.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28424539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28424498 and 28424507.

It is not an unprimeable number, because it can be changed into a prime (28424533) 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, 27667 + ... + 28675.

It is an arithmetic number, because the mean of its divisors is an integer number (2099790).

Almost surely, 2^28424539 is an apocalyptic number.

28424539 is a deficient number, since it is larger than the sum of its proper divisors (5172101).

28424539 is a wasteful number, since it uses less digits than its factorization.

28424539 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1230.

The product of its digits is 69120, while the sum is 37.

The square root of 28424539 is about 5331.4668713216. The cubic root of 28424539 is about 305.1859083380.

It can be divided in two parts, 2842 and 4539, that added together give a triangular number (7381 = T₁₂₁).

The spelling of 28424539 in words is "twenty-eight million, four hundred twenty-four thousand, five hundred thirty-nine".