28833557 has 4 divisors (see below), whose sum is σ = 28844460. Its totient is φ = 28822656.

The previous prime is 28833527. The next prime is 28833577. The reversal of 28833557 is 75533882.

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 can be written as a sum of positive squares in 2 ways, for example, as 39601 + 28793956 = 199^2 + 5366^2 .

It is a cyclic number.

It is not a de Polignac number, because 28833557 - 2¹² = 28829461 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 (28833527) 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, 1319 + ... + 7707.

It is an arithmetic number, because the mean of its divisors is an integer number (7211115).

Almost surely, 2^28833557 is an apocalyptic number.

It is an amenable number.

28833557 is a deficient number, since it is larger than the sum of its proper divisors (10903).

28833557 is an equidigital number, since it uses as much as digits as its factorization.

28833557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10902.

The product of its digits is 201600, while the sum is 41.

The square root of 28833557 is about 5369.6887246841. The cubic root of 28833557 is about 306.6427778861.

The spelling of 28833557 in words is "twenty-eight million, eight hundred thirty-three thousand, five hundred fifty-seven".