28822281 has 16 divisors (see below), whose sum is σ = 40181760. Its totient is φ = 18354960.

The previous prime is 28822279. The next prime is 28822291. The reversal of 28822281 is 18222882.

It is not a de Polignac number, because 28822281 - 2¹ = 28822279 is a prime.

It is a super-2 number, since 2×28822281² = 1661447764085922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28822231) 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, 5386 + ... + 9308.

It is an arithmetic number, because the mean of its divisors is an integer number (2511360).

Almost surely, 2^28822281 is an apocalyptic number.

It is an amenable number.

28822281 is a deficient number, since it is larger than the sum of its proper divisors (11359479).

28822281 is a wasteful number, since it uses less digits than its factorization.

28822281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4036.

The product of its digits is 8192, while the sum is 33.

The square root of 28822281 is about 5368.6386542586. The cubic root of 28822281 is about 306.6027995280.

The spelling of 28822281 in words is "twenty-eight million, eight hundred twenty-two thousand, two hundred eighty-one".