856648415 has 8 divisors (see below), whose sum is σ = 1174832160. Its totient is φ = 587416032.

The previous prime is 856648379. The next prime is 856648423. The reversal of 856648415 is 514846658.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 856648415 - 2¹² = 856644319 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 856648415.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 12237800 + ... + 12237869.

It is an arithmetic number, because the mean of its divisors is an integer number (146854020).

Almost surely, 2^856648415 is an apocalyptic number.

856648415 is a deficient number, since it is larger than the sum of its proper divisors (318183745).

856648415 is a wasteful number, since it uses less digits than its factorization.

856648415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24475681.

The product of its digits is 921600, while the sum is 47.

The square root of 856648415 is about 29268.5567631887. The cubic root of 856648415 is about 949.7315640460.

The spelling of 856648415 in words is "eight hundred fifty-six million, six hundred forty-eight thousand, four hundred fifteen".