28284651720 has 576 divisors, whose sum is σ = 108001857600. Its totient is φ = 6363878400.

The previous prime is 28284651713. The next prime is 28284651721. The reversal of 28284651720 is 2715648282.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (28284651721) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 85451955 + ... + 85452285.

It is an arithmetic number, because the mean of its divisors is an integer number (187503225).

Almost surely, 2^28284651720 is an apocalyptic number.

28284651720 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 28284651720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54000928800).

28284651720 is an abundant number, since it is smaller than the sum of its proper divisors (79717205880).

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

28284651720 is a wasteful number, since it uses less digits than its factorization.

28284651720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442 (or 404 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The spelling of 28284651720 in words is "twenty-eight billion, two hundred eighty-four million, six hundred fifty-one thousand, seven hundred twenty".