28288937 has 4 divisors (see below), whose sum is σ = 28299780. Its totient is φ = 28278096.

The previous prime is 28288927. The next prime is 28288943. The reversal of 28288937 is 73988282.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7595536 + 20693401 = 2756^2 + 4549^2 .

It is a cyclic number.

It is not a de Polignac number, because 28288937 - 2⁴ = 28288921 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28288891 and 28288900.

It is not an unprimeable number, because it can be changed into a prime (28288927) 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, 1139 + ... + 7607.

It is an arithmetic number, because the mean of its divisors is an integer number (7074945).

Almost surely, 2^28288937 is an apocalyptic number.

It is an amenable number.

28288937 is a deficient number, since it is larger than the sum of its proper divisors (10843).

28288937 is an equidigital number, since it uses as much as digits as its factorization.

28288937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10842.

The product of its digits is 387072, while the sum is 47.

The square root of 28288937 is about 5318.7345299422. The cubic root of 28288937 is about 304.6998282998.

The spelling of 28288937 in words is "twenty-eight million, two hundred eighty-eight thousand, nine hundred thirty-seven".