28867239 has 32 divisors (see below), whose sum is σ = 44452800. Its totient is φ = 18501120.

The previous prime is 28867217. The next prime is 28867253. The reversal of 28867239 is 93276882.

It is not a de Polignac number, because 28867239 - 2⁹ = 28866727 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

Its product of digits (290304) is a multiple of the sum of its prime factors (432).

It is a junction number, because it is equal to n+sod(n) for n = 28867194 and 28867203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28867039) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98377 + ... + 98669.

It is an arithmetic number, because the mean of its divisors is an integer number (1389150).

Almost surely, 2^28867239 is an apocalyptic number.

28867239 is a deficient number, since it is larger than the sum of its proper divisors (15585561).

28867239 is a wasteful number, since it uses less digits than its factorization.

28867239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 426 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28867239 is about 5372.8241177243. The cubic root of 28867239 is about 306.7621332950.

The spelling of 28867239 in words is "twenty-eight million, eight hundred sixty-seven thousand, two hundred thirty-nine".