28286390 has 32 divisors (see below), whose sum is σ = 55979424. Its totient is φ = 10205440.

The previous prime is 28286369. The next prime is 28286393. The reversal of 28286390 is 9368282.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28286393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14132 + ... + 16008.

It is an arithmetic number, because the mean of its divisors is an integer number (1749357).

Almost surely, 2^28286390 is an apocalyptic number.

28286390 is a deficient number, since it is larger than the sum of its proper divisors (27693034).

28286390 is a wasteful number, since it uses less digits than its factorization.

28286390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2032.

The product of its (nonzero) digits is 41472, while the sum is 38.

The square root of 28286390 is about 5318.4950878985. The cubic root of 28286390 is about 304.6906834557.

The spelling of 28286390 in words is "twenty-eight million, two hundred eighty-six thousand, three hundred ninety".