28158366 has 16 divisors (see below), whose sum is σ = 56613888. Its totient is φ = 9336600.

The previous prime is 28158343. The next prime is 28158373. The reversal of 28158366 is 66385182.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11140 + ... + 13431.

It is an arithmetic number, because the mean of its divisors is an integer number (3538368).

Almost surely, 2^28158366 is an apocalyptic number.

28158366 is an abundant number, since it is smaller than the sum of its proper divisors (28455522).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28158366 is a wasteful number, since it uses less digits than its factorization.

28158366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24767.

The product of its digits is 69120, while the sum is 39.

The square root of 28158366 is about 5306.4457031049. The cubic root of 28158366 is about 304.2303122544.

The spelling of 28158366 in words is "twenty-eight million, one hundred fifty-eight thousand, three hundred sixty-six".