28005286 has 4 divisors (see below), whose sum is σ = 42007932. Its totient is φ = 14002642.

The previous prime is 28005269. The next prime is 28005317. The reversal of 28005286 is 68250082.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7001320 + ... + 7001323.

It is an arithmetic number, because the mean of its divisors is an integer number (10501983).

Almost surely, 2^28005286 is an apocalyptic number.

28005286 is a deficient number, since it is larger than the sum of its proper divisors (14002646).

28005286 is a wasteful number, since it uses less digits than its factorization.

28005286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14002645.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 28005286 is about 5292.0020786088. The cubic root of 28005286 is about 303.6780048058.

The spelling of 28005286 in words is "twenty-eight million, five thousand, two hundred eighty-six".