28523561004 has 72 divisors (see below), whose sum is σ = 73816142400. Its totient is φ = 9281940192.

The previous prime is 28523560981. The next prime is 28523561057. The reversal of 28523561004 is 40016532582.

28523561004 is a `hidden beast` number, since 2 + 8 + 5 + 2 + 35 + 610 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28523561004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4174639 + ... + 4181465.

It is an arithmetic number, because the mean of its divisors is an integer number (1025224200).

Almost surely, 2^28523561004 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28523561004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36908071200).

28523561004 is an abundant number, since it is smaller than the sum of its proper divisors (45292581396).

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

28523561004 is a wasteful number, since it uses less digits than its factorization.

28523561004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9579 (or 9574 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The spelling of 28523561004 in words is "twenty-eight billion, five hundred twenty-three million, five hundred sixty-one thousand, four".