28331918333 has 4 divisors (see below), whose sum is σ = 28582643388. Its totient is φ = 28081193280.

The previous prime is 28331918287. The next prime is 28331918357. The reversal of 28331918333 is 33381913382.

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 10064503684 + 18267414649 = 100322^2 + 135157^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28331918333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28331918393) 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, 125362358 + ... + 125362583.

It is an arithmetic number, because the mean of its divisors is an integer number (7145660847).

Almost surely, 2^28331918333 is an apocalyptic number.

It is an amenable number.

28331918333 is a deficient number, since it is larger than the sum of its proper divisors (250725055).

28331918333 is a wasteful number, since it uses less digits than its factorization.

28331918333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250725054.

The product of its digits is 279936, while the sum is 44.

The spelling of 28331918333 in words is "twenty-eight billion, three hundred thirty-one million, nine hundred eighteen thousand, three hundred thirty-three".