3928637728 has 48 divisors (see below), whose sum is σ = 8191350720. Its totient is φ = 1850846976.

The previous prime is 3928637711. The next prime is 3928637777. The reversal of 3928637728 is 8277368293.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9478 + ... + 89146.

It is an arithmetic number, because the mean of its divisors is an integer number (170653140).

Almost surely, 2^3928637728 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 3928637728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4095675360).

3928637728 is an abundant number, since it is smaller than the sum of its proper divisors (4262712992).

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

3928637728 is a wasteful number, since it uses less digits than its factorization.

3928637728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79769 (or 79761 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 55.

The square root of 3928637728 is about 62678.8459370464. The cubic root of 3928637728 is about 1577.9043047877.

The spelling of 3928637728 in words is "three billion, nine hundred twenty-eight million, six hundred thirty-seven thousand, seven hundred twenty-eight".