28261224 has 40 divisors (see below), whose sum is σ = 79159410. Its totient is φ = 9420192.

The previous prime is 28261201. The next prime is 28261231. The reversal of 28261224 is 42216282.

It is a happy number.

28261224 is a `hidden beast` number, since 28 + 2 + 612 + 24 = 666.

It can be written as a sum of positive squares in only one way, i.e., 21068100 + 7193124 = 4590^2 + 2682^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

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

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 21159 + ... + 22454.

Almost surely, 2^28261224 is an apocalyptic number.

28261224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28261224 is an abundant number, since it is smaller than the sum of its proper divisors (50898186).

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

28261224 is a wasteful number, since it uses less digits than its factorization.

28261224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43631 (or 43618 counting only the distinct ones).

The product of its digits is 3072, while the sum is 27.

The square root of 28261224 is about 5316.1286666145. The cubic root of 28261224 is about 304.6002969853.

The spelling of 28261224 in words is "twenty-eight million, two hundred sixty-one thousand, two hundred twenty-four".