28177228 has 48 divisors (see below), whose sum is σ = 55732320. Its totient is φ = 12386304.

The previous prime is 28177207. The next prime is 28177229. The reversal of 28177228 is 82277182.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28177229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145900 + ... + 146092.

It is an arithmetic number, because the mean of its divisors is an integer number (1161090).

Almost surely, 2^28177228 is an apocalyptic number.

It is an amenable number.

28177228 is a deficient number, since it is larger than the sum of its proper divisors (27555092).

28177228 is a wasteful number, since it uses less digits than its factorization.

28177228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 346 (or 344 counting only the distinct ones).

The product of its digits is 25088, while the sum is 37.

The square root of 28177228 is about 5308.2226780722. Note that the first 3 decimals coincide. The cubic root of 28177228 is about 304.2982270774.

The spelling of 28177228 in words is "twenty-eight million, one hundred seventy-seven thousand, two hundred twenty-eight".