28206975 has 24 divisors (see below), whose sum is σ = 47778192. Its totient is φ = 14675200.

The previous prime is 28206953. The next prime is 28206979. The reversal of 28206975 is 57960282.

It is a happy number.

It is not a de Polignac number, because 28206975 - 2⁵ = 28206943 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28206979) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1512 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (1990758).

Almost surely, 2^28206975 is an apocalyptic number.

28206975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28206975 is a deficient number, since it is larger than the sum of its proper divisors (19571217).

28206975 is a wasteful number, since it uses less digits than its factorization.

28206975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9227 (or 9222 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 28206975 is about 5311.0239125803. The cubic root of 28206975 is about 304.4052730439.

The spelling of 28206975 in words is "twenty-eight million, two hundred six thousand, nine hundred seventy-five".