28053239 has 4 divisors (see below), whose sum is σ = 28065240. Its totient is φ = 28041240.

The previous prime is 28053217. The next prime is 28053287. The reversal of 28053239 is 93235082.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28053239 - 2¹² = 28049143 is a prime.

It is a super-2 number, since 2×28053239² = 1573968436782242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28053209) 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, 1229 + ... + 7590.

It is an arithmetic number, because the mean of its divisors is an integer number (7016310).

Almost surely, 2^28053239 is an apocalyptic number.

28053239 is a deficient number, since it is larger than the sum of its proper divisors (12001).

28053239 is an equidigital number, since it uses as much as digits as its factorization.

28053239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12000.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 28053239 is about 5296.5308457518. The cubic root of 28053239 is about 303.8512336227.

The spelling of 28053239 in words is "twenty-eight million, fifty-three thousand, two hundred thirty-nine".