28801928 has 16 divisors (see below), whose sum is σ = 54061260. Its totient is φ = 14385600.

The previous prime is 28801909. The next prime is 28801951. The reversal of 28801928 is 82910882.

It can be written as a sum of positive squares in 2 ways, for example, as 27269284 + 1532644 = 5222^2 + 1238^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28801891 and 28801900.

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, 11858 + ... + 14078.

Almost surely, 2^28801928 is an apocalyptic number.

It is an amenable number.

28801928 is a deficient number, since it is larger than the sum of its proper divisors (25259332).

28801928 is a wasteful number, since it uses less digits than its factorization.

28801928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3848 (or 3844 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 28801928 is about 5366.7427737875. The cubic root of 28801928 is about 306.5306128260.

The spelling of 28801928 in words is "twenty-eight million, eight hundred one thousand, nine hundred twenty-eight".