28065600 has 126 divisors (see below), whose sum is σ = 99802950. Its totient is φ = 7480320.

The previous prime is 28065593. The next prime is 28065601. The reversal of 28065600 is 656082.

28065600 is a `hidden beast` number, since 2 + 8 + 0 + 656 + 0 + 0 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 4562496 + 23503104 = 2136^2 + 4848^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28065601) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 13426 + ... + 15374.

Almost surely, 2^28065600 is an apocalyptic number.

28065600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28065600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49901475).

28065600 is an abundant number, since it is smaller than the sum of its proper divisors (71737350).

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

28065600 is a wasteful number, since it uses less digits than its factorization.

28065600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977 (or 1959 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 28065600 is about 5297.6976131146. The cubic root of 28065600 is about 303.8958553695.

The spelling of 28065600 in words is "twenty-eight million, sixty-five thousand, six hundred".