28819444 has 6 divisors (see below), whose sum is σ = 50434034. Its totient is φ = 14409720.

The previous prime is 28819423. The next prime is 28819459. The reversal of 28819444 is 44491882.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 17123044 + 11696400 = 4138^2 + 3420^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28819397 and 28819406.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3602427 + ... + 3602434.

Almost surely, 2^28819444 is an apocalyptic number.

It is an amenable number.

28819444 is a deficient number, since it is larger than the sum of its proper divisors (21614590).

28819444 is a wasteful number, since it uses less digits than its factorization.

28819444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7204865 (or 7204863 counting only the distinct ones).

The product of its digits is 73728, while the sum is 40.

The square root of 28819444 is about 5368.3744280741. The cubic root of 28819444 is about 306.5927394789.

The spelling of 28819444 in words is "twenty-eight million, eight hundred nineteen thousand, four hundred forty-four".