28390252 has 12 divisors (see below), whose sum is σ = 54199656. Its totient is φ = 12904640.

The previous prime is 28390247. The next prime is 28390253. The reversal of 28390252 is 25209382.

It is not an unprimeable number, because it can be changed into a prime (28390253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 322573 + ... + 322660.

It is an arithmetic number, because the mean of its divisors is an integer number (4516638).

Almost surely, 2^28390252 is an apocalyptic number.

28390252 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28390252 is a deficient number, since it is larger than the sum of its proper divisors (25809404).

28390252 is a wasteful number, since it uses less digits than its factorization.

28390252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645248 (or 645246 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 28390252 is about 5328.2503694928. The cubic root of 28390252 is about 305.0631491567.

The spelling of 28390252 in words is "twenty-eight million, three hundred ninety thousand, two hundred fifty-two".