1315553868 has 72 divisors (see below), whose sum is σ = 3425069648. Its totient is φ = 425513088.

The previous prime is 1315553849. The next prime is 1315553893. The reversal of 1315553868 is 8683555131.

1315553868 is a `hidden beast` number, since 1 + 3 + 1 + 55 + 538 + 68 = 666.

It is a super-2 number, since 2×1315553868² = 3461363959219522848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 240330 + ... + 245742.

Almost surely, 2^1315553868 is an apocalyptic number.

1315553868 is a gapful number since it is divisible by the number (18) 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 1315553868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1712534824).

1315553868 is an abundant number, since it is smaller than the sum of its proper divisors (2109515780).

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

1315553868 is a wasteful number, since it uses less digits than its factorization.

1315553868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623 (or 5618 counting only the distinct ones).

The product of its digits is 432000, while the sum is 45.

The square root of 1315553868 is about 36270.5647598711. The cubic root of 1315553868 is about 1095.7283001273.

The spelling of 1315553868 in words is "one billion, three hundred fifteen million, five hundred fifty-three thousand, eight hundred sixty-eight".