28413748728 has 128 divisors (see below), whose sum is σ = 84004948800. Its totient is φ = 8867708928.

The previous prime is 28413748723. The next prime is 28413748747. The reversal of 28413748728 is 82784731482.

28413748728 is a `hidden beast` number, since 2 + 8 + 4 + 137 + 487 + 28 = 666.

It is a super-2 number, since 2×28413748728² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28413748723) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 688650 + ... + 728742.

Almost surely, 2^28413748728 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 28413748728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42002474400).

28413748728 is an abundant number, since it is smaller than the sum of its proper divisors (55591200072).

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

28413748728 is a wasteful number, since it uses less digits than its factorization.

28413748728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40318 (or 40308 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 54.

The spelling of 28413748728 in words is "twenty-eight billion, four hundred thirteen million, seven hundred forty-eight thousand, seven hundred twenty-eight".