1315728856 has 32 divisors (see below), whose sum is σ = 2659109040. Its totient is φ = 606722688.

The previous prime is 1315728847. The next prime is 1315728881. The reversal of 1315728856 is 6588275131.

It is a super-2 number, since 2×1315728856² = 3462284845022137472, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127855 + ... + 137761.

Almost surely, 2^1315728856 is an apocalyptic number.

It is an amenable number.

1315728856 is an abundant number, since it is smaller than the sum of its proper divisors (1343380184).

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

1315728856 is a wasteful number, since it uses less digits than its factorization.

1315728856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11203 (or 11199 counting only the distinct ones).

The product of its digits is 403200, while the sum is 46.

The square root of 1315728856 is about 36272.9769387626. The cubic root of 1315728856 is about 1095.7768806296.

The spelling of 1315728856 in words is "one billion, three hundred fifteen million, seven hundred twenty-eight thousand, eight hundred fifty-six".