28211144 has 16 divisors (see below), whose sum is σ = 56965020. Its totient is φ = 13020480.

The previous prime is 28211129. The next prime is 28211149. The reversal of 28211144 is 44111282.

It can be written as a sum of positive squares in 2 ways, for example, as 27772900 + 438244 = 5270^2 + 662^2 .

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (28211149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135527 + ... + 135734.

Almost surely, 2^28211144 is an apocalyptic number.

It is an amenable number.

28211144 is an abundant number, since it is smaller than the sum of its proper divisors (28753876).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28211144 is a wasteful number, since it uses less digits than its factorization.

28211144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 271280 (or 271276 counting only the distinct ones).

The product of its digits is 512, while the sum is 23.

The square root of 28211144 is about 5311.4163836024. The cubic root of 28211144 is about 304.4202693709.

The spelling of 28211144 in words is "twenty-eight million, two hundred eleven thousand, one hundred forty-four".