28288042 has 4 divisors (see below), whose sum is σ = 42432066. Its totient is φ = 14144020.

The previous prime is 28288037. The next prime is 28288067. The reversal of 28288042 is 24088282.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24088282 = 2 ⋅12044141.

It can be written as a sum of positive squares in only one way, i.e., 20620681 + 7667361 = 4541^2 + 2769^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28287989 and 28288007.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7072009 + ... + 7072012.

Almost surely, 2^28288042 is an apocalyptic number.

28288042 is a deficient number, since it is larger than the sum of its proper divisors (14144024).

28288042 is a wasteful number, since it uses less digits than its factorization.

28288042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14144023.

The product of its (nonzero) digits is 16384, while the sum is 34.

The square root of 28288042 is about 5318.6503927218. The cubic root of 28288042 is about 304.6966149208.

The spelling of 28288042 in words is "twenty-eight million, two hundred eighty-eight thousand, forty-two".