856712784 has 40 divisors (see below), whose sum is σ = 2219000832. Its totient is φ = 284819200.

The previous prime is 856712771. The next prime is 856712789. The reversal of 856712784 is 487217658.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856712789) by changing a digit.

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, 4917 + ... + 41684.

Almost surely, 2^856712784 is an apocalyptic number.

It is an amenable number.

856712784 is an abundant number, since it is smaller than the sum of its proper divisors (1362288048).

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

856712784 is a wasteful number, since it uses less digits than its factorization.

856712784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46995 (or 46989 counting only the distinct ones).

The product of its digits is 752640, while the sum is 48.

The square root of 856712784 is about 29269.6563696945. The cubic root of 856712784 is about 949.7553512220.

The spelling of 856712784 in words is "eight hundred fifty-six million, seven hundred twelve thousand, seven hundred eighty-four".