28137224 has 8 divisors (see below), whose sum is σ = 52757310. Its totient is φ = 14068608.

The previous prime is 28137209. The next prime is 28137247. The reversal of 28137224 is 42273182.

It can be written as a sum of positive squares in only one way, i.e., 15760900 + 12376324 = 3970^2 + 3518^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1758569 + ... + 1758584.

Almost surely, 2^28137224 is an apocalyptic number.

It is an amenable number.

28137224 is a deficient number, since it is larger than the sum of its proper divisors (24620086).

28137224 is a wasteful number, since it uses less digits than its factorization.

28137224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3517159 (or 3517155 counting only the distinct ones).

The product of its digits is 5376, while the sum is 29.

The square root of 28137224 is about 5304.4532234718. The cubic root of 28137224 is about 304.1541519673.

The spelling of 28137224 in words is "twenty-eight million, one hundred thirty-seven thousand, two hundred twenty-four".