1328071860 has 72 divisors (see below), whose sum is σ = 4032723240. Its totient is φ = 353779968.

The previous prime is 1328071847. The next prime is 1328071867. The reversal of 1328071860 is 681708231.

It can be written as a sum of positive squares in 4 ways, for example, as 132848676 + 1195223184 = 11526^2 + 34572^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328071867) 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, 196294 + ... + 202946.

It is an arithmetic number, because the mean of its divisors is an integer number (56010045).

Almost surely, 2^1328071860 is an apocalyptic number.

1328071860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1328071860 is an abundant number, since it is smaller than the sum of its proper divisors (2704651380).

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

1328071860 is a wasteful number, since it uses less digits than its factorization.

1328071860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7777 (or 7772 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1328071860 is about 36442.7202607050. The cubic root of 1328071860 is about 1099.1927576069.

The spelling of 1328071860 in words is "one billion, three hundred twenty-eight million, seventy-one thousand, eight hundred sixty".