28200840 has 32 divisors (see below), whose sum is σ = 84602880. Its totient is φ = 7520192.

The previous prime is 28200839. The next prime is 28200853. The reversal of 28200840 is 4800282.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28200840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117384 + ... + 117623.

It is an arithmetic number, because the mean of its divisors is an integer number (2643840).

Almost surely, 2^28200840 is an apocalyptic number.

28200840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28200840 is an abundant number, since it is smaller than the sum of its proper divisors (56402040).

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

28200840 is a wasteful number, since it uses less digits than its factorization.

28200840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235021 (or 235017 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 24.

The square root of 28200840 is about 5310.4463089273. The cubic root of 28200840 is about 304.3832021227.

The spelling of 28200840 in words is "twenty-eight million, two hundred thousand, eight hundred forty".