671542636 has 24 divisors (see below), whose sum is σ = 1245990816. Its totient is φ = 315598080.

The previous prime is 671542621. The next prime is 671542643. The reversal of 671542636 is 636245176.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48001 + ... + 60391.

It is an arithmetic number, because the mean of its divisors is an integer number (51916284).

Almost surely, 2^671542636 is an apocalyptic number.

It is an amenable number.

671542636 is a deficient number, since it is larger than the sum of its proper divisors (574448180).

671542636 is a wasteful number, since it uses less digits than its factorization.

671542636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13209 (or 13207 counting only the distinct ones).

The product of its digits is 181440, while the sum is 40.

The square root of 671542636 is about 25914.1396924536. The cubic root of 671542636 is about 875.7050691496.

The spelling of 671542636 in words is "six hundred seventy-one million, five hundred forty-two thousand, six hundred thirty-six".