28525806234 has 128 divisors (see below), whose sum is σ = 68528332800. Its totient is φ = 8763068160.

The previous prime is 28525806233. The next prime is 28525806241. The reversal of 28525806234 is 43260852582.

28525806234 is a `hidden beast` number, since 2 + 8 + 5 + 2 + 580 + 62 + 3 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 28525806234.

It is not an unprimeable number, because it can be changed into a prime (28525806233) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11008279 + ... + 11010869.

It is an arithmetic number, because the mean of its divisors is an integer number (535377600).

Almost surely, 2^28525806234 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28525806234, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34264166400).

28525806234 is an abundant number, since it is smaller than the sum of its proper divisors (40002526566).

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

28525806234 is a wasteful number, since it uses less digits than its factorization.

28525806234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2865 (or 2859 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 28525806234 in words is "twenty-eight billion, five hundred twenty-five million, eight hundred six thousand, two hundred thirty-four".