671663836 has 12 divisors (see below), whose sum is σ = 1175732712. Its totient is φ = 335740208.

The previous prime is 671663833. The next prime is 671663843. The reversal of 671663836 is 638366176.

It is a super-2 number, since 2×671663836² = 902264617180469792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671663833) 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, 4870 + ... + 36973.

It is an arithmetic number, because the mean of its divisors is an integer number (97977726).

Almost surely, 2^671663836 is an apocalyptic number.

It is an amenable number.

671663836 is a deficient number, since it is larger than the sum of its proper divisors (504068876).

671663836 is a wasteful number, since it uses less digits than its factorization.

671663836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45860 (or 45858 counting only the distinct ones).

The product of its digits is 653184, while the sum is 46.

The square root of 671663836 is about 25916.4780786279. The cubic root of 671663836 is about 875.7577483910.

The spelling of 671663836 in words is "six hundred seventy-one million, six hundred sixty-three thousand, eight hundred thirty-six".