820860671 has 4 divisors (see below), whose sum is σ = 820929792. Its totient is φ = 820791552.

The previous prime is 820860653. The next prime is 820860673. The reversal of 820860671 is 176068028.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-820860671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (820860673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11711 + ... + 42176.

It is an arithmetic number, because the mean of its divisors is an integer number (205232448).

Almost surely, 2^820860671 is an apocalyptic number.

820860671 is a deficient number, since it is larger than the sum of its proper divisors (69121).

820860671 is a wasteful number, since it uses less digits than its factorization.

820860671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69120.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 820860671 is about 28650.6661528140. Note that the first 3 decimals coincide. The cubic root of 820860671 is about 936.3175191873.

The spelling of 820860671 in words is "eight hundred twenty million, eight hundred sixty thousand, six hundred seventy-one".