1312072660 has 24 divisors (see below), whose sum is σ = 2756042856. Its totient is φ = 524697600.

The previous prime is 1312072649. The next prime is 1312072669. The reversal of 1312072660 is 662702131.

It can be written as a sum of positive squares in 4 ways, for example, as 83429956 + 1228642704 = 9134^2 + 35052^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312072669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 131860 + ... + 141460.

It is an arithmetic number, because the mean of its divisors is an integer number (114835119).

Almost surely, 2^1312072660 is an apocalyptic number.

1312072660 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312072660 is an abundant number, since it is smaller than the sum of its proper divisors (1443970196).

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

1312072660 is a wasteful number, since it uses less digits than its factorization.

1312072660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16443 (or 16441 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 1312072660 is about 36222.5435329989. The cubic root of 1312072660 is about 1094.7609439011.

Adding to 1312072660 its reverse (662702131), we get a palindrome (1974774791).

The spelling of 1312072660 in words is "one billion, three hundred twelve million, seventy-two thousand, six hundred sixty".