1312761216 has 256 divisors, whose sum is σ = 4112640000. Its totient is φ = 367165440.

The previous prime is 1312761211. The next prime is 1312761227. The reversal of 1312761216 is 6121672131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312761211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2630535 + ... + 2631033.

It is an arithmetic number, because the mean of its divisors is an integer number (16065000).

Almost surely, 2^1312761216 is an apocalyptic number.

1312761216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1312761216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2056320000).

1312761216 is an abundant number, since it is smaller than the sum of its proper divisors (2799878784).

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

1312761216 is a wasteful number, since it uses less digits than its factorization.

1312761216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 577 (or 565 counting only the distinct ones).

The product of its digits is 3024, while the sum is 30.

The square root of 1312761216 is about 36232.0468094200. The cubic root of 1312761216 is about 1094.9524151044.

The spelling of 1312761216 in words is "one billion, three hundred twelve million, seven hundred sixty-one thousand, two hundred sixteen".