28338237 has 6 divisors (see below), whose sum is σ = 40933022. Its totient is φ = 18892152.

The previous prime is 28338229. The next prime is 28338239. The reversal of 28338237 is 73283382.

It can be written as a sum of positive squares in only one way, i.e., 17189316 + 11148921 = 4146^2 + 3339^2 .

It is not a de Polignac number, because 28338237 - 2³ = 28338229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28338239) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1574338 + ... + 1574355.

Almost surely, 2^28338237 is an apocalyptic number.

It is an amenable number.

28338237 is a deficient number, since it is larger than the sum of its proper divisors (12594785).

28338237 is a wasteful number, since it uses less digits than its factorization.

28338237 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3148699 (or 3148696 counting only the distinct ones).

The product of its digits is 48384, while the sum is 36.

The square root of 28338237 is about 5323.3670735729. The cubic root of 28338237 is about 304.8767288282.

The spelling of 28338237 in words is "twenty-eight million, three hundred thirty-eight thousand, two hundred thirty-seven".