28257005 has 16 divisors (see below), whose sum is σ = 38956800. Its totient is φ = 19274112.

The previous prime is 28256989. The next prime is 28257007. The reversal of 28257005 is 50075282.

It is a cyclic number.

It is not a de Polignac number, because 28257005 - 2⁴ = 28256989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28257007) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4937 + ... + 8993.

It is an arithmetic number, because the mean of its divisors is an integer number (2434800).

Almost surely, 2^28257005 is an apocalyptic number.

It is an amenable number.

28257005 is a deficient number, since it is larger than the sum of its proper divisors (10699795).

28257005 is a wasteful number, since it uses less digits than its factorization.

28257005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268.

The product of its (nonzero) digits is 5600, while the sum is 29.

The square root of 28257005 is about 5315.7318404901. The cubic root of 28257005 is about 304.5851387293.

The spelling of 28257005 in words is "twenty-eight million, two hundred fifty-seven thousand, five".