4381390728 has 192 divisors, whose sum is σ = 14675169600. Its totient is φ = 1161008640.

The previous prime is 4381390721. The next prime is 4381390733. The reversal of 4381390728 is 8270931834.

It is a super-2 number, since 2×4381390728² = 38393169422808739968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (4381390721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 184426 + ... + 206822.

It is an arithmetic number, because the mean of its divisors is an integer number (76433175).

Almost surely, 2^4381390728 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 4381390728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7337584800).

4381390728 is an abundant number, since it is smaller than the sum of its proper divisors (10293778872).

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

4381390728 is a wasteful number, since it uses less digits than its factorization.

4381390728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22452 (or 22445 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 4381390728 is about 66192.0745104729. The cubic root of 4381390728 is about 1636.3291293666.

The spelling of 4381390728 in words is "four billion, three hundred eighty-one million, three hundred ninety thousand, seven hundred twenty-eight".