1313664638 has 32 divisors (see below), whose sum is σ = 2346738912. Its totient is φ = 543628800.

The previous prime is 1313664637. The next prime is 1313664661. The reversal of 1313664638 is 8364663131.

It is a super-2 number, since 2×1313664638² = 3451429562263342088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1313664595 and 1313664604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1313664631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10583 + ... + 52338.

It is an arithmetic number, because the mean of its divisors is an integer number (73335591).

Almost surely, 2^1313664638 is an apocalyptic number.

1313664638 is a deficient number, since it is larger than the sum of its proper divisors (1033074274).

1313664638 is a wasteful number, since it uses less digits than its factorization.

1313664638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63020.

The product of its digits is 186624, while the sum is 41.

The square root of 1313664638 is about 36244.5118328279. The cubic root of 1313664638 is about 1095.2035339566.

The spelling of 1313664638 in words is "one billion, three hundred thirteen million, six hundred sixty-four thousand, six hundred thirty-eight".