28573840 has 40 divisors (see below), whose sum is σ = 66745728. Its totient is φ = 11376000.

The previous prime is 28573819. The next prime is 28573841. The reversal of 28573840 is 4837582.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 28573840.

It is not an unprimeable number, because it can be changed into a prime (28573841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19369 + ... + 20791.

Almost surely, 2^28573840 is an apocalyptic number.

28573840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28573840 is an abundant number, since it is smaller than the sum of its proper divisors (38171888).

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

28573840 is a wasteful number, since it uses less digits than its factorization.

28573840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1687 (or 1681 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 37.

The square root of 28573840 is about 5345.4504019774. The cubic root of 28573840 is about 305.7193091522.

The spelling of 28573840 in words is "twenty-eight million, five hundred seventy-three thousand, eight hundred forty".