28868239 has 8 divisors (see below), whose sum is σ = 30489840. Its totient is φ = 27256896.

The previous prime is 28868237. The next prime is 28868249. The reversal of 28868239 is 93286882.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28868239 - 2¹ = 28868237 is a prime.

It is a super-2 number, since 2×28868239² = 1666750445922242, 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 (28868237) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3627 + ... + 8419.

It is an arithmetic number, because the mean of its divisors is an integer number (3811230).

Almost surely, 2^28868239 is an apocalyptic number.

28868239 is a deficient number, since it is larger than the sum of its proper divisors (1621601).

28868239 is a wasteful number, since it uses less digits than its factorization.

28868239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5129.

The product of its digits is 331776, while the sum is 46.

The square root of 28868239 is about 5372.9171778467. The cubic root of 28868239 is about 306.7656754718.

The spelling of 28868239 in words is "twenty-eight million, eight hundred sixty-eight thousand, two hundred thirty-nine".