856878577 has 4 divisors (see below), whose sum is σ = 864886896. Its totient is φ = 848870260.

The previous prime is 856878569. The next prime is 856878601. The reversal of 856878577 is 775878658.

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.

It is a cyclic number.

It is not a de Polignac number, because 856878577 - 2³ = 856878569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (856878277) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4003999 + ... + 4004212.

It is an arithmetic number, because the mean of its divisors is an integer number (216221724).

Almost surely, 2^856878577 is an apocalyptic number.

It is an amenable number.

856878577 is a deficient number, since it is larger than the sum of its proper divisors (8008319).

856878577 is a wasteful number, since it uses less digits than its factorization.

856878577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8008318.

The product of its digits is 26342400, while the sum is 61.

The square root of 856878577 is about 29272.4883978113. The cubic root of 856878577 is about 949.8166135398.

The spelling of 856878577 in words is "eight hundred fifty-six million, eight hundred seventy-eight thousand, five hundred seventy-seven".