3928387860 has 72 divisors (see below), whose sum is σ = 11921549640. Its totient is φ = 1047091968.

The previous prime is 3928387849. The next prime is 3928387867. The reversal of 3928387860 is 687838293.

It can be written as a sum of positive squares in 4 ways, for example, as 1871946756 + 2056441104 = 43266^2 + 45348^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3928387797 and 3928387806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3928387867) 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, 582186 + ... + 588894.

Almost surely, 2^3928387860 is an apocalyptic number.

3928387860 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3928387860 is an abundant number, since it is smaller than the sum of its proper divisors (7993161780).

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

3928387860 is a wasteful number, since it uses less digits than its factorization.

3928387860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9977 (or 9972 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 3928387860 is about 62676.8526650788. The cubic root of 3928387860 is about 1577.8708516182.

The spelling of 3928387860 in words is "three billion, nine hundred twenty-eight million, three hundred eighty-seven thousand, eight hundred sixty".