28697239 has 8 divisors (see below), whose sum is σ = 30659840. Its totient is φ = 26779896.

The previous prime is 28697233. The next prime is 28697243. The reversal of 28697239 is 93279682.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28697239 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 (28697233) 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, 9999 + ... + 12544.

It is an arithmetic number, because the mean of its divisors is an integer number (3832480).

Almost surely, 2^28697239 is an apocalyptic number.

28697239 is a deficient number, since it is larger than the sum of its proper divisors (1962601).

28697239 is a wasteful number, since it uses less digits than its factorization.

28697239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22629.

The product of its digits is 326592, while the sum is 46.

The square root of 28697239 is about 5356.9803994415. The cubic root of 28697239 is about 306.1587703271.

The spelling of 28697239 in words is "twenty-eight million, six hundred ninety-seven thousand, two hundred thirty-nine".