28122660720 has 960 divisors, whose sum is σ = 127254426624. Its totient is φ = 5386567680.

The previous prime is 28122660719. The next prime is 28122660739. The reversal of 28122660720 is 2706622182.

28122660720 is a `hidden beast` number, since 2 + 8 + 1 + 2 + 26 + 607 + 20 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 49951159 + ... + 49951721.

Almost surely, 2^28122660720 is an apocalyptic number.

28122660720 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 28122660720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63627213312).

28122660720 is an abundant number, since it is smaller than the sum of its proper divisors (99131765904).

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

28122660720 is a wasteful number, since it uses less digits than its factorization.

28122660720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670 (or 661 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 28122660720 in words is "twenty-eight billion, one hundred twenty-two million, six hundred sixty thousand, seven hundred twenty".