28104422400 has 396 divisors, whose sum is σ = 101263157632. Its totient is φ = 7447265280.

The previous prime is 28104422399. The next prime is 28104422429. The reversal of 28104422400 is 422440182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 51378927 + ... + 51379473.

Almost surely, 2^28104422400 is an apocalyptic number.

28104422400 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 28104422400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50631578816).

28104422400 is an abundant number, since it is smaller than the sum of its proper divisors (73158735232).

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

28104422400 is a wasteful number, since it uses less digits than its factorization.

28104422400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

Adding to 28104422400 its reverse (422440182), we get a palindrome (28526862582).

The spelling of 28104422400 in words is "twenty-eight billion, one hundred four million, four hundred twenty-two thousand, four hundred".