28751311933 has 4 divisors (see below), whose sum is σ = 28751706880. Its totient is φ = 28750916988.

The previous prime is 28751311873. The next prime is 28751311973. The reversal of 28751311933 is 33911315782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28751311933 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 28751311933.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28751311973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53085 + ... + 245602.

It is an arithmetic number, because the mean of its divisors is an integer number (7187926720).

Almost surely, 2^28751311933 is an apocalyptic number.

It is an amenable number.

28751311933 is a deficient number, since it is larger than the sum of its proper divisors (394947).

28751311933 is an equidigital number, since it uses as much as digits as its factorization.

28751311933 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394946.

The product of its digits is 136080, while the sum is 43.

The spelling of 28751311933 in words is "twenty-eight billion, seven hundred fifty-one million, three hundred eleven thousand, nine hundred thirty-three".