28345909833 has 12 divisors (see below), whose sum is σ = 41103410868. Its totient is φ = 18823741440.

The previous prime is 28345909793. The next prime is 28345909861. The reversal of 28345909833 is 33890954382.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28152477369 + 193432464 = 167787^2 + 13908^2 .

It is not a de Polignac number, because 28345909833 - 2¹⁰ = 28345908809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28345909833.

It is not an unprimeable number, because it can be changed into a prime (28345909883) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6125208 + ... + 6129833.

It is an arithmetic number, because the mean of its divisors is an integer number (3425284239).

Almost surely, 2^28345909833 is an apocalyptic number.

It is an amenable number.

28345909833 is a deficient number, since it is larger than the sum of its proper divisors (12757501035).

28345909833 is a wasteful number, since it uses less digits than its factorization.

28345909833 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12255304 (or 12255301 counting only the distinct ones).

The product of its (nonzero) digits is 5598720, while the sum is 54.

The spelling of 28345909833 in words is "twenty-eight billion, three hundred forty-five million, nine hundred nine thousand, eight hundred thirty-three".