1264317520 has 20 divisors (see below), whose sum is σ = 2939538420. Its totient is φ = 505726976.

The previous prime is 1264317511. The next prime is 1264317559. The reversal of 1264317520 is 257134621.

It can be written as a sum of positive squares in 2 ways, for example, as 256128016 + 1008189504 = 16004^2 + 31752^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 7901905 + ... + 7902064.

It is an arithmetic number, because the mean of its divisors is an integer number (146976921).

Almost surely, 2^1264317520 is an apocalyptic number.

1264317520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1264317520 is an abundant number, since it is smaller than the sum of its proper divisors (1675220900).

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

1264317520 is a wasteful number, since it uses less digits than its factorization.

1264317520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15803982 (or 15803976 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 1264317520 is about 35557.2428627418. The cubic root of 1264317520 is about 1081.3145629752.

The spelling of 1264317520 in words is "one billion, two hundred sixty-four million, three hundred seventeen thousand, five hundred twenty".