4521607728 has 80 divisors (see below), whose sum is σ = 12834595200. Its totient is φ = 1360304640.

The previous prime is 4521607687. The next prime is 4521607729. The reversal of 4521607728 is 8277061254.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 4521607728.

It is not an unprimeable number, because it can be changed into a prime (4521607729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42588 + ... + 104196.

It is an arithmetic number, because the mean of its divisors is an integer number (160432440).

Almost surely, 2^4521607728 is an apocalyptic number.

4521607728 is a gapful number since it is divisible by the number (48) 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 4521607728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6417297600).

4521607728 is an abundant number, since it is smaller than the sum of its proper divisors (8312987472).

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

4521607728 is a wasteful number, since it uses less digits than its factorization.

4521607728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61770 (or 61764 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 4521607728 is about 67242.9009487247. The cubic root of 4521607728 is about 1653.6018930864.

The spelling of 4521607728 in words is "four billion, five hundred twenty-one million, six hundred seven thousand, seven hundred twenty-eight".