4391317728 has 144 divisors (see below), whose sum is σ = 14292192096. Its totient is φ = 1252869120.

The previous prime is 4391317727. The next prime is 4391317739. The reversal of 4391317728 is 8277131934.

It is a tau number, because it is divible by the number of its divisors (144).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4391317727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2137950 + ... + 2140002.

It is an arithmetic number, because the mean of its divisors is an integer number (99251334).

Almost surely, 2^4391317728 is an apocalyptic number.

4391317728 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 4391317728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7146096048).

4391317728 is an abundant number, since it is smaller than the sum of its proper divisors (9900874368).

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

4391317728 is a wasteful number, since it uses less digits than its factorization.

4391317728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3137 (or 3126 counting only the distinct ones).

The product of its digits is 254016, while the sum is 45.

The square root of 4391317728 is about 66267.0184028224. The cubic root of 4391317728 is about 1637.5640178379.

The spelling of 4391317728 in words is "four billion, three hundred ninety-one million, three hundred seventeen thousand, seven hundred twenty-eight".