28283720 has 32 divisors (see below), whose sum is σ = 64108800. Its totient is φ = 11229888.

The previous prime is 28283719. The next prime is 28283741. The reversal of 28283720 is 2738282.

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, 3017 + ... + 8103.

It is an arithmetic number, because the mean of its divisors is an integer number (2003400).

Almost surely, 2^28283720 is an apocalyptic number.

28283720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28283720 is an abundant number, since it is smaller than the sum of its proper divisors (35825080).

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

28283720 is a wasteful number, since it uses less digits than its factorization.

28283720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5237 (or 5233 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 28283720 is about 5318.2440711197. The cubic root of 28283720 is about 304.6810963984.

The spelling of 28283720 in words is "twenty-eight million, two hundred eighty-three thousand, seven hundred twenty".