28257842 has 12 divisors (see below), whose sum is σ = 45027690. Its totient is φ = 13297536.

The previous prime is 28257841. The next prime is 28257847. The reversal of 28257842 is 24875282.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 28185481 + 72361 = 5309^2 + 269^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28257796 and 28257805.

It is not an unprimeable number, because it can be changed into a prime (28257841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23867 + ... + 25022.

Almost surely, 2^28257842 is an apocalyptic number.

28257842 is a deficient number, since it is larger than the sum of its proper divisors (16769848).

28257842 is a wasteful number, since it uses less digits than its factorization.

28257842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48925 (or 48908 counting only the distinct ones).

The product of its digits is 71680, while the sum is 38.

The square root of 28257842 is about 5315.8105684834. The cubic root of 28257842 is about 304.5881460690.

The spelling of 28257842 in words is "twenty-eight million, two hundred fifty-seven thousand, eight hundred forty-two".