28424711688 has 128 divisors (see below), whose sum is σ = 78277104000. Its totient is φ = 8561315840.

The previous prime is 28424711669. The next prime is 28424711699. The reversal of 28424711688 is 88611742482.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 28424711688.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2111218 + ... + 2124638.

It is an arithmetic number, because the mean of its divisors is an integer number (611539875).

Almost surely, 2^28424711688 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 28424711688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39138552000).

28424711688 is an abundant number, since it is smaller than the sum of its proper divisors (49852392312).

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

28424711688 is a wasteful number, since it uses less digits than its factorization.

28424711688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13655 (or 13651 counting only the distinct ones).

The product of its digits is 1376256, while the sum is 51.

The spelling of 28424711688 in words is "twenty-eight billion, four hundred twenty-four million, seven hundred eleven thousand, six hundred eighty-eight".