28239766 has 8 divisors (see below), whose sum is σ = 42382224. Its totient is φ = 14112360.

The previous prime is 28239727. The next prime is 28239779. The reversal of 28239766 is 66793282.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5191 + ... + 9133.

It is an arithmetic number, because the mean of its divisors is an integer number (5297778).

Almost surely, 2^28239766 is an apocalyptic number.

28239766 is a deficient number, since it is larger than the sum of its proper divisors (14142458).

28239766 is a wasteful number, since it uses less digits than its factorization.

28239766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7526.

The product of its digits is 217728, while the sum is 43.

The square root of 28239766 is about 5314.1100854235. The cubic root of 28239766 is about 304.5231858158.

The spelling of 28239766 in words is "twenty-eight million, two hundred thirty-nine thousand, seven hundred sixty-six".