28555430904 has 960 divisors, whose sum is σ = 115406121600. Its totient is φ = 6466521600.

The previous prime is 28555430881. The next prime is 28555430909. The reversal of 28555430904 is 40903455582.

28555430904 is a `hidden beast` number, since 2 + 8 + 5 + 554 + 3 + 0 + 90 + 4 = 666.

It is a super-2 number, since 2×28555430904² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28555430904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28555430909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 86270019 + ... + 86270349.

It is an arithmetic number, because the mean of its divisors is an integer number (120214710).

Almost surely, 2^28555430904 is an apocalyptic number.

28555430904 is a gapful number since it is divisible by the number (24) 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 28555430904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57703060800).

28555430904 is an abundant number, since it is smaller than the sum of its proper divisors (86850690696).

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

28555430904 is a wasteful number, since it uses less digits than its factorization.

28555430904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406 (or 386 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 45.

The spelling of 28555430904 in words is "twenty-eight billion, five hundred fifty-five million, four hundred thirty thousand, nine hundred four".