28196237 has 4 divisors (see below), whose sum is σ = 28257600. Its totient is φ = 28134876.

The previous prime is 28196227. The next prime is 28196239. The reversal of 28196237 is 73269182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28196237 - 2⁶ = 28196173 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28196237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28196239) 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, 29987 + ... + 30912.

It is an arithmetic number, because the mean of its divisors is an integer number (7064400).

Almost surely, 2^28196237 is an apocalyptic number.

It is an amenable number.

28196237 is a deficient number, since it is larger than the sum of its proper divisors (61363).

28196237 is an equidigital number, since it uses as much as digits as its factorization.

28196237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61362.

The product of its digits is 36288, while the sum is 38.

The square root of 28196237 is about 5310.0129001727. The cubic root of 28196237 is about 304.3666405343.

The spelling of 28196237 in words is "twenty-eight million, one hundred ninety-six thousand, two hundred thirty-seven".