28122868 has 6 divisors (see below), whose sum is σ = 49215026. Its totient is φ = 14061432.

The previous prime is 28122863. The next prime is 28122877. The reversal of 28122868 is 86822182.

It can be written as a sum of positive squares in only one way, i.e., 28111204 + 11664 = 5302^2 + 108^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28122863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3515355 + ... + 3515362.

Almost surely, 2^28122868 is an apocalyptic number.

It is an amenable number.

28122868 is a deficient number, since it is larger than the sum of its proper divisors (21092158).

28122868 is a wasteful number, since it uses less digits than its factorization.

28122868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7030721 (or 7030719 counting only the distinct ones).

The product of its digits is 24576, while the sum is 37.

The square root of 28122868 is about 5303.0998482020. The cubic root of 28122868 is about 304.1024152854.

The spelling of 28122868 in words is "twenty-eight million, one hundred twenty-two thousand, eight hundred sixty-eight".