671724866 has 8 divisors (see below), whose sum is σ = 1009981884. Its totient is φ = 335064240.

The previous prime is 671724839. The next prime is 671724877. The reversal of 671724866 is 668427176.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 671587225 + 137641 = 25915^2 + 371^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 671724866.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 398045 + ... + 399728.

Almost surely, 2^671724866 is an apocalyptic number.

671724866 is a deficient number, since it is larger than the sum of its proper divisors (338257018).

671724866 is a wasteful number, since it uses less digits than its factorization.

671724866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798196.

The product of its digits is 677376, while the sum is 47.

The square root of 671724866 is about 25917.6554881031. The cubic root of 671724866 is about 875.7842725110.

The spelling of 671724866 in words is "six hundred seventy-one million, seven hundred twenty-four thousand, eight hundred sixty-six".