28350820 has 12 divisors (see below), whose sum is σ = 59536764. Its totient is φ = 11340320.

The previous prime is 28350811. The next prime is 28350821. The reversal of 28350820 is 2805382.

It can be written as a sum of positive squares in 2 ways, for example, as 11573604 + 16777216 = 3402^2 + 4096^2 .

It is not an unprimeable number, because it can be changed into a prime (28350821) 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 3 ways as a sum of consecutive naturals, for example, 708751 + ... + 708790.

It is an arithmetic number, because the mean of its divisors is an integer number (4961397).

Almost surely, 2^28350820 is an apocalyptic number.

28350820 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28350820 is an abundant number, since it is smaller than the sum of its proper divisors (31185944).

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

28350820 is a wasteful number, since it uses less digits than its factorization.

28350820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1417550 (or 1417548 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 28350820 is about 5324.5488071761. The cubic root of 28350820 is about 304.9218468574.

The spelling of 28350820 in words is "twenty-eight million, three hundred fifty thousand, eight hundred twenty".