28169842 has 4 divisors (see below), whose sum is σ = 42254766. Its totient is φ = 14084920.

The previous prime is 28169821. The next prime is 28169881. The reversal of 28169842 is 24896182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 24890121 + 3279721 = 4989^2 + 1811^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28169795 and 28169804.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7042459 + ... + 7042462.

Almost surely, 2^28169842 is an apocalyptic number.

28169842 is a deficient number, since it is larger than the sum of its proper divisors (14084924).

28169842 is a wasteful number, since it uses less digits than its factorization.

28169842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14084923.

The product of its digits is 55296, while the sum is 40.

The square root of 28169842 is about 5307.5269193853. The cubic root of 28169842 is about 304.2716365375.

The spelling of 28169842 in words is "twenty-eight million, one hundred sixty-nine thousand, eight hundred forty-two".