1313647816 has 64 divisors (see below), whose sum is σ = 2755468800. Its totient is φ = 586497600.

The previous prime is 1313647799. The next prime is 1313647823. The reversal of 1313647816 is 6187463131.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 543651 + ... + 546061.

It is an arithmetic number, because the mean of its divisors is an integer number (43054200).

Almost surely, 2^1313647816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1313647816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1377734400).

1313647816 is an abundant number, since it is smaller than the sum of its proper divisors (1441820984).

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

1313647816 is a wasteful number, since it uses less digits than its factorization.

1313647816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487 (or 2457 counting only the distinct ones).

The product of its digits is 72576, while the sum is 40.

The square root of 1313647816 is about 36244.2797693650. The cubic root of 1313647816 is about 1095.1988590972.

The spelling of 1313647816 in words is "one billion, three hundred thirteen million, six hundred forty-seven thousand, eight hundred sixteen".