28442840 has 32 divisors (see below), whose sum is σ = 64957680. Its totient is φ = 11206272.

The previous prime is 28442839. The next prime is 28442857. The reversal of 28442840 is 4824482.

It is a junction number, because it is equal to n+sod(n) for n = 28442797 and 28442806.

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, 2627 + ... + 7986.

Almost surely, 2^28442840 is an apocalyptic number.

28442840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28442840 is an abundant number, since it is smaller than the sum of its proper divisors (36514840).

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

28442840 is a wasteful number, since it uses less digits than its factorization.

28442840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10691 (or 10687 counting only the distinct ones).

The product of its (nonzero) digits is 16384, while the sum is 32.

The square root of 28442840 is about 5333.1829145455. The cubic root of 28442840 is about 305.2513917696.

The spelling of 28442840 in words is "twenty-eight million, four hundred forty-two thousand, eight hundred forty".