28228277 has 16 divisors (see below), whose sum is σ = 35862912. Its totient is φ = 21577920.

The previous prime is 28228271. The next prime is 28228289. The reversal of 28228277 is 77282282.

It is not a de Polignac number, because 28228277 - 2⁸ = 28228021 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28228277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28228271) 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, 623 + ... + 7539.

It is an arithmetic number, because the mean of its divisors is an integer number (2241432).

Almost surely, 2^28228277 is an apocalyptic number.

It is an amenable number.

28228277 is a deficient number, since it is larger than the sum of its proper divisors (7634635).

28228277 is a wasteful number, since it uses less digits than its factorization.

28228277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6988.

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

The square root of 28228277 is about 5313.0289854282. The cubic root of 28228277 is about 304.4818830485.

The spelling of 28228277 in words is "twenty-eight million, two hundred twenty-eight thousand, two hundred seventy-seven".