28350920 has 32 divisors (see below), whose sum is σ = 68697720. Its totient is φ = 10467840.

The previous prime is 28350913. The next prime is 28350923. The reversal of 28350920 is 2905382.

It can be written as a sum of positive squares in 4 ways, for example, as 16337764 + 12013156 = 4042^2 + 3466^2 .

It is not an unprimeable number, because it can be changed into a prime (28350923) 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 7 ways as a sum of consecutive naturals, for example, 26741 + ... + 27780.

Almost surely, 2^28350920 is an apocalyptic number.

28350920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28350920 is an abundant number, since it is smaller than the sum of its proper divisors (40346800).

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

28350920 is a wasteful number, since it uses less digits than its factorization.

28350920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54545 (or 54541 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 28350920 is about 5324.5581976348. The cubic root of 28350920 is about 304.9222053673.

The spelling of 28350920 in words is "twenty-eight million, three hundred fifty thousand, nine hundred twenty".