1320805072 has 20 divisors (see below), whose sum is σ = 2709593316. Its totient is φ = 621555200.

The previous prime is 1320805063. The next prime is 1320805091. The reversal of 1320805072 is 2705080231.

It can be written as a sum of positive squares in 2 ways, for example, as 684554896 + 636250176 = 26164^2 + 25224^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1320805072.

It is a congruent 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, 2427679 + ... + 2428222.

Almost surely, 2^1320805072 is an apocalyptic number.

It is an amenable number.

1320805072 is an abundant number, since it is smaller than the sum of its proper divisors (1388788244).

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

1320805072 is a wasteful number, since it uses less digits than its factorization.

1320805072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4855926 (or 4855920 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1320805072 is about 36342.8819990930. The cubic root of 1320805072 is about 1097.1842785055.

The spelling of 1320805072 in words is "one billion, three hundred twenty million, eight hundred five thousand, seventy-two".