28343383531 has 4 divisors (see below), whose sum is σ = 28374226000. Its totient is φ = 28312541064.

The previous prime is 28343383477. The next prime is 28343383573. The reversal of 28343383531 is 13538334382.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28343383531 - 2⁷ = 28343383403 is a prime.

It is a super-3 number, since 3×28343383531³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28343380531) 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, 15419856 + ... + 15421693.

It is an arithmetic number, because the mean of its divisors is an integer number (7093556500).

Almost surely, 2^28343383531 is an apocalyptic number.

28343383531 is a deficient number, since it is larger than the sum of its proper divisors (30842469).

28343383531 is an equidigital number, since it uses as much as digits as its factorization.

28343383531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30842468.

The product of its digits is 622080, while the sum is 43.

The spelling of 28343383531 in words is "twenty-eight billion, three hundred forty-three million, three hundred eighty-three thousand, five hundred thirty-one".