671686772 has 6 divisors (see below), whose sum is σ = 1175451858. Its totient is φ = 335843384.

The previous prime is 671686759. The next prime is 671686783. The reversal of 671686772 is 277686176.

It can be written as a sum of positive squares in only one way, i.e., 668015716 + 3671056 = 25846^2 + 1916^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 671686772.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83960843 + ... + 83960850.

It is an arithmetic number, because the mean of its divisors is an integer number (195908643).

Almost surely, 2^671686772 is an apocalyptic number.

It is an amenable number.

671686772 is a deficient number, since it is larger than the sum of its proper divisors (503765086).

671686772 is a wasteful number, since it uses less digits than its factorization.

671686772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167921697 (or 167921695 counting only the distinct ones).

The product of its digits is 1185408, while the sum is 50.

The square root of 671686772 is about 25916.9205732471. The cubic root of 671686772 is about 875.7677167462.

The spelling of 671686772 in words is "six hundred seventy-one million, six hundred eighty-six thousand, seven hundred seventy-two".