28519217800 has 48 divisors (see below), whose sum is σ = 66915555300. Its totient is φ = 11303020800.

The previous prime is 28519217773. The next prime is 28519217809. The reversal of 28519217800 is 871291582.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 8325102564 + 20194115236 = 91242^2 + 142106^2 .

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28519217809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 632311 + ... + 675910.

Almost surely, 2^28519217800 is an apocalyptic number.

28519217800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28519217800 is an abundant number, since it is smaller than the sum of its proper divisors (38396337500).

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

28519217800 is a wasteful number, since it uses less digits than its factorization.

28519217800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1308346 (or 1308337 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 43.

The spelling of 28519217800 in words is "twenty-eight billion, five hundred nineteen million, two hundred seventeen thousand, eight hundred".