671408605 has 16 divisors (see below), whose sum is σ = 969252480. Its totient is φ = 436162752.

The previous prime is 671408581. The next prime is 671408651. The reversal of 671408605 is 506804176.

It is a cyclic number.

It is not a de Polignac number, because 671408605 - 2¹⁹ = 670884317 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 504154 + ... + 505483.

It is an arithmetic number, because the mean of its divisors is an integer number (60578280).

Almost surely, 2^671408605 is an apocalyptic number.

It is an amenable number.

671408605 is a deficient number, since it is larger than the sum of its proper divisors (297843875).

671408605 is a wasteful number, since it uses less digits than its factorization.

671408605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009668.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 671408605 is about 25911.5535041803. The cubic root of 671408605 is about 875.6468055689.

The spelling of 671408605 in words is "six hundred seventy-one million, four hundred eight thousand, six hundred five".