28211600 has 30 divisors (see below), whose sum is σ = 67779330. Its totient is φ = 11284480.

The previous prime is 28211591. The next prime is 28211621. The reversal of 28211600 is 611282.

It can be written as a sum of positive squares in 3 ways, for example, as 2119936 + 26091664 = 1456^2 + 5108^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34865 + ... + 35664.

It is an arithmetic number, because the mean of its divisors is an integer number (2259311).

Almost surely, 2^28211600 is an apocalyptic number.

28211600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28211600 is an abundant number, since it is smaller than the sum of its proper divisors (39567730).

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

28211600 is a wasteful number, since it uses less digits than its factorization.

28211600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70547 (or 70536 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

The square root of 28211600 is about 5311.4593098319. The cubic root of 28211600 is about 304.4219095607.

Adding to 28211600 its reverse (611282), we get a palindrome (28822882).

The spelling of 28211600 in words is "twenty-eight million, two hundred eleven thousand, six hundred".