28772844 has 24 divisors (see below), whose sum is σ = 67791360. Its totient is φ = 9497424.

The previous prime is 28772833. The next prime is 28772869. The reversal of 28772844 is 44827782.

It is a junction number, because it is equal to n+sod(n) for n = 28772796 and 28772805.

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, 10404 + ... + 12875.

It is an arithmetic number, because the mean of its divisors is an integer number (2824640).

Almost surely, 2^28772844 is an apocalyptic number.

It is an amenable number.

28772844 is an abundant number, since it is smaller than the sum of its proper divisors (39018516).

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

28772844 is a wasteful number, since it uses less digits than its factorization.

28772844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23389 (or 23387 counting only the distinct ones).

The product of its digits is 200704, while the sum is 42.

The square root of 28772844 is about 5364.0324383807. The cubic root of 28772844 is about 306.4274005359.

The spelling of 28772844 in words is "twenty-eight million, seven hundred seventy-two thousand, eight hundred forty-four".