27728228 has 24 divisors (see below), whose sum is σ = 53089344. Its totient is φ = 12567200.

The previous prime is 27728227. The next prime is 27728231. The reversal of 27728228 is 82282772.

It is a junction number, because it is equal to n+sod(n) for n = 27728191 and 27728200.

It is not an unprimeable number, because it can be changed into a prime (27728227) 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, 19601 + ... + 20967.

It is an arithmetic number, because the mean of its divisors is an integer number (2212056).

Almost surely, 2^27728228 is an apocalyptic number.

It is an amenable number.

27728228 is a deficient number, since it is larger than the sum of its proper divisors (25361116).

27728228 is a wasteful number, since it uses less digits than its factorization.

27728228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843 (or 1841 counting only the distinct ones).

The product of its digits is 50176, while the sum is 38.

The square root of 27728228 is about 5265.7599641457. The cubic root of 27728228 is about 302.6732491167.

The spelling of 27728228 in words is "twenty-seven million, seven hundred twenty-eight thousand, two hundred twenty-eight".