28557263 has 8 divisors (see below), whose sum is σ = 34556832. Its totient is φ = 23037696.

The previous prime is 28557241. The next prime is 28557299. The reversal of 28557263 is 36275582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28557263 - 2¹⁸ = 28295119 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 (28557233) 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 7 ways as a sum of consecutive naturals, for example, 119870 + ... + 120107.

It is an arithmetic number, because the mean of its divisors is an integer number (4319604).

Almost surely, 2^28557263 is an apocalyptic number.

28557263 is a deficient number, since it is larger than the sum of its proper divisors (5999569).

28557263 is a wasteful number, since it uses less digits than its factorization.

28557263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 240001.

The product of its digits is 100800, while the sum is 38.

The square root of 28557263 is about 5343.8996060929. The cubic root of 28557263 is about 305.6601771006.

The spelling of 28557263 in words is "twenty-eight million, five hundred fifty-seven thousand, two hundred sixty-three".