28255837 has 4 divisors (see below), whose sum is σ = 28789020. Its totient is φ = 27722656.

The previous prime is 28255807. The next prime is 28255841. The reversal of 28255837 is 73855282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73855282 = 2 ⋅36927641.

It can be written as a sum of positive squares in 2 ways, for example, as 22174681 + 6081156 = 4709^2 + 2466^2 .

It is a cyclic number.

It is not a de Polignac number, because 28255837 - 2¹¹ = 28253789 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 28255837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28255807) 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, 266512 + ... + 266617.

It is an arithmetic number, because the mean of its divisors is an integer number (7197255).

Almost surely, 2^28255837 is an apocalyptic number.

It is an amenable number.

28255837 is a deficient number, since it is larger than the sum of its proper divisors (533183).

28255837 is an equidigital number, since it uses as much as digits as its factorization.

28255837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 533182.

The product of its digits is 134400, while the sum is 40.

The square root of 28255837 is about 5315.6219767775. The cubic root of 28255837 is about 304.5809420077.

It can be divided in two parts, 28255 and 837, that added together give a palindrome (29092).

The spelling of 28255837 in words is "twenty-eight million, two hundred fifty-five thousand, eight hundred thirty-seven".