28803720 has 64 divisors (see below), whose sum is σ = 94271040. Its totient is φ = 6982400.

The previous prime is 28803701. The next prime is 28803721. The reversal of 28803720 is 2730882.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (28803721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9591 + ... + 12230.

It is an arithmetic number, because the mean of its divisors is an integer number (1472985).

Almost surely, 2^28803720 is an apocalyptic number.

28803720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28803720 is an abundant number, since it is smaller than the sum of its proper divisors (65467320).

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

28803720 is a wasteful number, since it uses less digits than its factorization.

28803720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21846 (or 21842 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 28803720 is about 5366.9097253447. The cubic root of 28803720 is about 306.5369699406.

The spelling of 28803720 in words is "twenty-eight million, eight hundred three thousand, seven hundred twenty".