3128162720 has 48 divisors (see below), whose sum is σ = 7645133160. Its totient is φ = 1208116224.

The previous prime is 3128162683. The next prime is 3128162731. The reversal of 3128162720 is 272618213.

It can be written as a sum of positive squares in 4 ways, for example, as 2520441616 + 607721104 = 50204^2 + 24652^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 332447 + ... + 341726.

Almost surely, 2^3128162720 is an apocalyptic number.

It is an amenable number.

3128162720 is an abundant number, since it is smaller than the sum of its proper divisors (4516970440).

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

3128162720 is a wasteful number, since it uses less digits than its factorization.

3128162720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674217 (or 674209 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 3128162720 is about 55929.9805113501. The cubic root of 3128162720 is about 1462.5019214429.

The spelling of 3128162720 in words is "three billion, one hundred twenty-eight million, one hundred sixty-two thousand, seven hundred twenty".