28943351 has 4 divisors (see below), whose sum is σ = 28954632. Its totient is φ = 28932072.

The previous prime is 28943297. The next prime is 28943357. The reversal of 28943351 is 15334982.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 28943351 - 2¹⁰ = 28942327 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 (28943357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 281 + ... + 7613.

It is an arithmetic number, because the mean of its divisors is an integer number (7238658).

Almost surely, 2^28943351 is an apocalyptic number.

28943351 is a deficient number, since it is larger than the sum of its proper divisors (11281).

28943351 is an equidigital number, since it uses as much as digits as its factorization.

28943351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11280.

The product of its digits is 25920, while the sum is 35.

The square root of 28943351 is about 5379.9025084104. The cubic root of 28943351 is about 307.0315019646.

The spelling of 28943351 in words is "twenty-eight million, nine hundred forty-three thousand, three hundred fifty-one".