28257503 has 8 divisors (see below), whose sum is σ = 30165120. Its totient is φ = 26391960.

The previous prime is 28257499. The next prime is 28257521. The reversal of 28257503 is 30575282.

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 28257503 - 2² = 28257499 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28257503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28257563) 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 7 ways as a sum of consecutive naturals, for example, 9125 + ... + 11822.

It is an arithmetic number, because the mean of its divisors is an integer number (3770640).

Almost surely, 2^28257503 is an apocalyptic number.

28257503 is a deficient number, since it is larger than the sum of its proper divisors (1907617).

28257503 is a wasteful number, since it uses less digits than its factorization.

28257503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21037.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 28257503 is about 5315.7786823757. The cubic root of 28257503 is about 304.5869280497.

The spelling of 28257503 in words is "twenty-eight million, two hundred fifty-seven thousand, five hundred three".