28666238 has 8 divisors (see below), whose sum is σ = 43037832. Its totient is φ = 14320296.

The previous prime is 28666229. The next prime is 28666247. The reversal of 28666238 is 83266682.

It is an interprime number because it is at equal distance from previous prime (28666229) and next prime (28666247).

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

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28666195 and 28666204.

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, 3320 + ... + 8267.

It is an arithmetic number, because the mean of its divisors is an integer number (5379729).

Almost surely, 2^28666238 is an apocalyptic number.

28666238 is a deficient number, since it is larger than the sum of its proper divisors (14371594).

28666238 is a wasteful number, since it uses less digits than its factorization.

28666238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12826.

The product of its digits is 165888, while the sum is 41.

The square root of 28666238 is about 5354.0861031552. The cubic root of 28666238 is about 306.0484850622.

The spelling of 28666238 in words is "twenty-eight million, six hundred sixty-six thousand, two hundred thirty-eight".