1263319864 has 16 divisors (see below), whose sum is σ = 2370679920. Its totient is φ = 631138560.

The previous prime is 1263319801. The next prime is 1263319877. The reversal of 1263319864 is 4689133621.

It is a self number, because there is not a number n which added to its sum of digits gives 1263319864.

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, 54777 + ... + 74344.

It is an arithmetic number, because the mean of its divisors is an integer number (148167495).

Almost surely, 2^1263319864 is an apocalyptic number.

It is an amenable number.

1263319864 is a deficient number, since it is larger than the sum of its proper divisors (1107360056).

1263319864 is a wasteful number, since it uses less digits than its factorization.

1263319864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130350 (or 130346 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 1263319864 is about 35543.2112223980. The cubic root of 1263319864 is about 1081.0300711922.

The spelling of 1263319864 in words is "one billion, two hundred sixty-three million, three hundred nineteen thousand, eight hundred sixty-four".