28685944 has 16 divisors (see below), whose sum is σ = 61470000. Its totient is φ = 12293952.

The previous prime is 28685939. The next prime is 28685957. The reversal of 28685944 is 44958682.

It is a super-2 number, since 2×28685944² = 1645766766342272, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28685894 and 28685903.

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, 256069 + ... + 256180.

It is an arithmetic number, because the mean of its divisors is an integer number (3841875).

Almost surely, 2^28685944 is an apocalyptic number.

It is an amenable number.

28685944 is an abundant number, since it is smaller than the sum of its proper divisors (32784056).

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

28685944 is a wasteful number, since it uses less digits than its factorization.

28685944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512262 (or 512258 counting only the distinct ones).

The product of its digits is 552960, while the sum is 46.

The square root of 28685944 is about 5355.9260637167. The cubic root of 28685944 is about 306.1185978550.

It can be divided in two parts, 286859 and 44, that added together give a triangular number (286903 = T₇₅₇).

The spelling of 28685944 in words is "twenty-eight million, six hundred eighty-five thousand, nine hundred forty-four".