28103821600 has 72 divisors (see below), whose sum is σ = 68853163428. Its totient is φ = 11201433600.

The previous prime is 28103821573. The next prime is 28103821637. The reversal of 28103821600 is 612830182.

It can be written as a sum of positive squares in 6 ways, for example, as 5335425936 + 22768395664 = 73044^2 + 150892^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162292 + ... + 287308.

Almost surely, 2^28103821600 is an apocalyptic number.

28103821600 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 28103821600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34426581714).

28103821600 is an abundant number, since it is smaller than the sum of its proper divisors (40749341828).

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

28103821600 is a wasteful number, since it uses less digits than its factorization.

28103821600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125318 (or 125305 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The spelling of 28103821600 in words is "twenty-eight billion, one hundred three million, eight hundred twenty-one thousand, six hundred".