28159432 has 16 divisors (see below), whose sum is σ = 60341760. Its totient is φ = 12068304.

The previous prime is 28159421. The next prime is 28159433. The reversal of 28159432 is 23495182.

It is a super-2 number, since 2×28159432² = 1585907221125248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28159433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251368 + ... + 251479.

It is an arithmetic number, because the mean of its divisors is an integer number (3771360).

Almost surely, 2^28159432 is an apocalyptic number.

It is an amenable number.

28159432 is an abundant number, since it is smaller than the sum of its proper divisors (32182328).

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

28159432 is a wasteful number, since it uses less digits than its factorization.

28159432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502860 (or 502856 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 28159432 is about 5306.5461460351. The cubic root of 28159432 is about 304.2341513197.

The spelling of 28159432 in words is "twenty-eight million, one hundred fifty-nine thousand, four hundred thirty-two".