28257550333 has 4 divisors (see below), whose sum is σ = 28263183228. Its totient is φ = 28251917440.

The previous prime is 28257550273. The next prime is 28257550337. The reversal of 28257550333 is 33305575282.

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 26957370969 + 1300179364 = 164187^2 + 36058^2 .

It is a cyclic number.

It is not a de Polignac number, because 28257550333 - 2²⁹ = 27720679421 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 28257550333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28257550337) 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, 2808916 + ... + 2818957.

It is an arithmetic number, because the mean of its divisors is an integer number (7065795807).

Almost surely, 2^28257550333 is an apocalyptic number.

It is an amenable number.

28257550333 is a deficient number, since it is larger than the sum of its proper divisors (5632895).

28257550333 is an equidigital number, since it uses as much as digits as its factorization.

28257550333 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5632894.

The product of its (nonzero) digits is 756000, while the sum is 43.

The spelling of 28257550333 in words is "twenty-eight billion, two hundred fifty-seven million, five hundred fifty thousand, three hundred thirty-three".