855728761 has 4 divisors (see below), whose sum is σ = 855787392. Its totient is φ = 855670132.

The previous prime is 855728759. The next prime is 855728791. The reversal of 855728761 is 167827558.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 167827558 = 2 ⋅83913779.

It is a cyclic number.

It is not a de Polignac number, because 855728761 - 2¹ = 855728759 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (855728791) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11796 + ... + 43018.

It is an arithmetic number, because the mean of its divisors is an integer number (213946848).

Almost surely, 2^855728761 is an apocalyptic number.

It is an amenable number.

855728761 is a deficient number, since it is larger than the sum of its proper divisors (58631).

855728761 is a wasteful number, since it uses less digits than its factorization.

855728761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58630.

The product of its digits is 940800, while the sum is 49.

The square root of 855728761 is about 29252.8419303151. The cubic root of 855728761 is about 949.3915812488.

The spelling of 855728761 in words is "eight hundred fifty-five million, seven hundred twenty-eight thousand, seven hundred sixty-one".