4491648728 has 64 divisors (see below), whose sum is σ = 9883944000. Its totient is φ = 1873428480.

The previous prime is 4491648691. The next prime is 4491648737. The reversal of 4491648728 is 8278461944.

It is a self number, because there is not a number n which added to its sum of digits gives 4491648728.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1028726 + ... + 1033082.

It is an arithmetic number, because the mean of its divisors is an integer number (154436625).

Almost surely, 2^4491648728 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 4491648728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4941972000).

4491648728 is an abundant number, since it is smaller than the sum of its proper divisors (5392295272).

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

4491648728 is a wasteful number, since it uses less digits than its factorization.

4491648728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4860 (or 4856 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 53.

The square root of 4491648728 is about 67019.7637119081. The cubic root of 4491648728 is about 1649.9416848689.

The spelling of 4491648728 in words is "four billion, four hundred ninety-one million, six hundred forty-eight thousand, seven hundred twenty-eight".