28124279 has 4 divisors (see below), whose sum is σ = 28778376. Its totient is φ = 27470184.

The previous prime is 28124221. The next prime is 28124293. The reversal of 28124279 is 97242182.

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 28124279 - 2¹⁶ = 28058743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28124209) 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, 326984 + ... + 327069.

It is an arithmetic number, because the mean of its divisors is an integer number (7194594).

Almost surely, 2^28124279 is an apocalyptic number.

28124279 is a deficient number, since it is larger than the sum of its proper divisors (654097).

28124279 is an equidigital number, since it uses as much as digits as its factorization.

28124279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654096.

The product of its digits is 16128, while the sum is 35.

The square root of 28124279 is about 5303.2328819315. The cubic root of 28124279 is about 304.1075010793.

The spelling of 28124279 in words is "twenty-eight million, one hundred twenty-four thousand, two hundred seventy-nine".