28864444 has 12 divisors (see below), whose sum is σ = 57728944. Its totient is φ = 12370464.

The previous prime is 28864421. The next prime is 28864499. The reversal of 28864444 is 44446882.

28864444 is an admirable number.

It is a super-2 number, since 2×28864444² = 1666312254858272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28864397 and 28864406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 515409 + ... + 515464.

Almost surely, 2^28864444 is an apocalyptic number.

It is an amenable number.

28864444 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28864444 is a wasteful number, since it uses less digits than its factorization.

28864444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1030884 (or 1030882 counting only the distinct ones).

The product of its digits is 196608, while the sum is 40.

The square root of 28864444 is about 5372.5640061334. The cubic root of 28864444 is about 306.7522324770.

The spelling of 28864444 in words is "twenty-eight million, eight hundred sixty-four thousand, four hundred forty-four".