28639227 has 8 divisors (see below), whose sum is σ = 38210560. Its totient is φ = 19080360.

The previous prime is 28639223. The next prime is 28639229. The reversal of 28639227 is 72293682.

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

It is not a de Polignac number, because 28639227 - 2² = 28639223 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28639223) 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, 6402 + ... + 9912.

It is an arithmetic number, because the mean of its divisors is an integer number (4776320).

Almost surely, 2^28639227 is an apocalyptic number.

28639227 is a deficient number, since it is larger than the sum of its proper divisors (9571333).

28639227 is a wasteful number, since it uses less digits than its factorization.

28639227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6233.

The product of its digits is 72576, while the sum is 39.

The square root of 28639227 is about 5351.5630427007. The cubic root of 28639227 is about 305.9523292820.

It can be divided in two parts, 2863 and 9227, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 28639227 in words is "twenty-eight million, six hundred thirty-nine thousand, two hundred twenty-seven".