28945237 has 4 divisors (see below), whose sum is σ = 30647916. Its totient is φ = 27242560.

The previous prime is 28945199. The next prime is 28945249. The reversal of 28945237 is 73254982.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13883076 + 15062161 = 3726^2 + 3881^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28945237 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 28945237.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28945297) 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, 851314 + ... + 851347.

It is an arithmetic number, because the mean of its divisors is an integer number (7661979).

Almost surely, 2^28945237 is an apocalyptic number.

It is an amenable number.

28945237 is a deficient number, since it is larger than the sum of its proper divisors (1702679).

28945237 is a wasteful number, since it uses less digits than its factorization.

28945237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702678.

The product of its digits is 120960, while the sum is 40.

The square root of 28945237 is about 5380.0777875417. The cubic root of 28945237 is about 307.0381707252.

The spelling of 28945237 in words is "twenty-eight million, nine hundred forty-five thousand, two hundred thirty-seven".