28159418 has 12 divisors (see below), whose sum is σ = 49135482. Its totient is φ = 12068280.

The previous prime is 28159409. The next prime is 28159421. The reversal of 28159418 is 81495182.

It can be written as a sum of positive squares in only one way, i.e., 26759929 + 1399489 = 5173^2 + 1183^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 143573 + ... + 143768.

Almost surely, 2^28159418 is an apocalyptic number.

28159418 is a deficient number, since it is larger than the sum of its proper divisors (20976064).

28159418 is a wasteful number, since it uses less digits than its factorization.

28159418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287357 (or 287350 counting only the distinct ones).

The product of its digits is 23040, while the sum is 38.

The square root of 28159418 is about 5306.5448269095. The cubic root of 28159418 is about 304.2341009011.

The spelling of 28159418 in words is "twenty-eight million, one hundred fifty-nine thousand, four hundred eighteen".