28302820 has 48 divisors (see below), whose sum is σ = 73156608. Its totient is φ = 8956800.

The previous prime is 28302809. The next prime is 28302821. The reversal of 28302820 is 2820382.

It is not an unprimeable number, because it can be changed into a prime (28302821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5956 + ... + 9595.

It is an arithmetic number, because the mean of its divisors is an integer number (1524096).

Almost surely, 2^28302820 is an apocalyptic number.

28302820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28302820 is an abundant number, since it is smaller than the sum of its proper divisors (44853788).

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

28302820 is a wasteful number, since it uses less digits than its factorization.

28302820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15580 (or 15578 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 28302820 is about 5320.0394735378. The cubic root of 28302820 is about 304.7496646947.

The spelling of 28302820 in words is "twenty-eight million, three hundred two thousand, eight hundred twenty".