815278648 has 32 divisors (see below), whose sum is σ = 1561809600. Its totient is φ = 398839168.

The previous prime is 815278627. The next prime is 815278661. The reversal of 815278648 is 846872518.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162465 + ... + 167407.

It is an arithmetic number, because the mean of its divisors is an integer number (48806550).

Almost surely, 2^815278648 is an apocalyptic number.

It is an amenable number.

815278648 is a deficient number, since it is larger than the sum of its proper divisors (746530952).

815278648 is a wasteful number, since it uses less digits than its factorization.

815278648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5391 (or 5387 counting only the distinct ones).

The product of its digits is 860160, while the sum is 49.

The square root of 815278648 is about 28553.0847370297. The cubic root of 815278648 is about 934.1903055310.

The spelling of 815278648 in words is "eight hundred fifteen million, two hundred seventy-eight thousand, six hundred forty-eight".