1312260640 has 48 divisors (see below), whose sum is σ = 3103251480. Its totient is φ = 524390400.

The previous prime is 1312260623. The next prime is 1312260661. The reversal of 1312260640 is 460622131.

It can be written as a sum of positive squares in 4 ways, for example, as 617621904 + 694638736 = 24852^2 + 26356^2 .

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, 188746 + ... + 195574.

Almost surely, 2^1312260640 is an apocalyptic number.

1312260640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1312260640 is an abundant number, since it is smaller than the sum of its proper divisors (1790990840).

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

1312260640 is a wasteful number, since it uses less digits than its factorization.

1312260640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8045 (or 8037 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 1312260640 is about 36225.1382330006. The cubic root of 1312260640 is about 1094.8132233572.

Adding to 1312260640 its reverse (460622131), we get a palindrome (1772882771).

The spelling of 1312260640 in words is "one billion, three hundred twelve million, two hundred sixty thousand, six hundred forty".