3928643660 has 12 divisors (see below), whose sum is σ = 8250151728. Its totient is φ = 1571457456.

The previous prime is 3928643651. The next prime is 3928643689. The reversal of 3928643660 is 663468293.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98216072 + ... + 98216111.

It is an arithmetic number, because the mean of its divisors is an integer number (687512644).

Almost surely, 2^3928643660 is an apocalyptic number.

It is an amenable number.

3928643660 is an abundant number, since it is smaller than the sum of its proper divisors (4321508068).

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

3928643660 is a wasteful number, since it uses less digits than its factorization.

3928643660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196432192 (or 196432190 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 47.

The square root of 3928643660 is about 62678.8932576190. The cubic root of 3928643660 is about 1577.9050989666.

The spelling of 3928643660 in words is "three billion, nine hundred twenty-eight million, six hundred forty-three thousand, six hundred sixty".