28688645832 has 384 divisors, whose sum is σ = 96565478400. Its totient is φ = 7003584000.

The previous prime is 28688645819. The next prime is 28688645833. The reversal of 28688645832 is 23854688682.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28688645833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 37112998 + ... + 37113770.

It is an arithmetic number, because the mean of its divisors is an integer number (251472600).

Almost surely, 2^28688645832 is an apocalyptic number.

28688645832 is a gapful number since it is divisible by the number (22) 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 28688645832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48282739200).

28688645832 is an abundant number, since it is smaller than the sum of its proper divisors (67876832568).

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

28688645832 is a wasteful number, since it uses less digits than its factorization.

28688645832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 977 (or 966 counting only the distinct ones).

The product of its digits is 35389440, while the sum is 60.

The spelling of 28688645832 in words is "twenty-eight billion, six hundred eighty-eight million, six hundred forty-five thousand, eight hundred thirty-two".