28513689800 has 24 divisors (see below), whose sum is σ = 66294329250. Its totient is φ = 11405475840.

The previous prime is 28513689781. The next prime is 28513689803. The reversal of 28513689800 is 898631582.

It can be written as a sum of positive squares in 3 ways, for example, as 25053191524 + 3460498276 = 158282^2 + 58826^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (28513689803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 71284025 + ... + 71284424.

Almost surely, 2^28513689800 is an apocalyptic number.

28513689800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28513689800 is an abundant number, since it is smaller than the sum of its proper divisors (37780639450).

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

28513689800 is a wasteful number, since it uses less digits than its factorization.

28513689800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142568465 (or 142568456 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 50.

The spelling of 28513689800 in words is "twenty-eight billion, five hundred thirteen million, six hundred eighty-nine thousand, eight hundred".