3781351728 has 640 divisors, whose sum is σ = 14780006400. Its totient is φ = 895795200.

The previous prime is 3781351711. The next prime is 3781351729. The reversal of 3781351728 is 8271531873.

3781351728 is a `hidden beast` number, since 37 + 81 + 3 + 517 + 28 = 666.

It is not an unprimeable number, because it can be changed into a prime (3781351729) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 19592400 + ... + 19592592.

It is an arithmetic number, because the mean of its divisors is an integer number (23093760).

Almost surely, 2^3781351728 is an apocalyptic number.

3781351728 is a gapful number since it is divisible by the number (38) 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 3781351728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7390003200).

3781351728 is an abundant number, since it is smaller than the sum of its proper divisors (10998654672).

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

3781351728 is a wasteful number, since it uses less digits than its factorization.

3781351728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 266 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 3781351728 is about 61492.6965419472. The cubic root of 3781351728 is about 1557.9338920153.

The spelling of 3781351728 in words is "three billion, seven hundred eighty-one million, three hundred fifty-one thousand, seven hundred twenty-eight".