28257866 has 32 divisors (see below), whose sum is σ = 52590720. Its totient is φ = 11088576.

The previous prime is 28257847. The next prime is 28257907. The reversal of 28257866 is 66875282.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24740 + ... + 25856.

It is an arithmetic number, because the mean of its divisors is an integer number (1643460).

Almost surely, 2^28257866 is an apocalyptic number.

28257866 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28257866 is a deficient number, since it is larger than the sum of its proper divisors (24332854).

28257866 is a wasteful number, since it uses less digits than its factorization.

28257866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278.

The product of its digits is 322560, while the sum is 44.

The square root of 28257866 is about 5315.8128258997. The cubic root of 28257866 is about 304.5882323001.

The spelling of 28257866 in words is "twenty-eight million, two hundred fifty-seven thousand, eight hundred sixty-six".