28864657320 has 128 divisors (see below), whose sum is σ = 88270041600. Its totient is φ = 7548879104.

The previous prime is 28864657267. The next prime is 28864657331. The reversal of 28864657320 is 2375646882.

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, 3131839 + ... + 3141041.

It is an arithmetic number, because the mean of its divisors is an integer number (689609700).

Almost surely, 2^28864657320 is an apocalyptic number.

28864657320 is a gapful number since it is divisible by the number (20) 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 28864657320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44135020800).

28864657320 is an abundant number, since it is smaller than the sum of its proper divisors (59405384280).

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

28864657320 is a wasteful number, since it uses less digits than its factorization.

28864657320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9719 (or 9715 counting only the distinct ones).

The product of its (nonzero) digits is 3870720, while the sum is 51.

The spelling of 28864657320 in words is "twenty-eight billion, eight hundred sixty-four million, six hundred fifty-seven thousand, three hundred twenty".