28550020 has 12 divisors (see below), whose sum is σ = 59955084. Its totient is φ = 11420000.

The previous prime is 28549957. The next prime is 28550057. The reversal of 28550020 is 2005582.

It can be written as a sum of positive squares in 2 ways, for example, as 4813636 + 23736384 = 2194^2 + 4872^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28549973 and 28550000.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713731 + ... + 713770.

It is an arithmetic number, because the mean of its divisors is an integer number (4996257).

Almost surely, 2^28550020 is an apocalyptic number.

28550020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28550020 is an abundant number, since it is smaller than the sum of its proper divisors (31405064).

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

28550020 is a wasteful number, since it uses less digits than its factorization.

28550020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1427510 (or 1427508 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 22.

The square root of 28550020 is about 5343.2218744873. The cubic root of 28550020 is about 305.6343333090.

It can be divided in two parts, 285 and 50020, that added together give a palindrome (50305).

The spelling of 28550020 in words is "twenty-eight million, five hundred fifty thousand, twenty".