671656 has 16 divisors (see below), whose sum is σ = 1281600. Its totient is φ = 329904.

The previous prime is 671651. The next prime is 671681. The reversal of 671656 is 656176.

It is a super-2 number, since 2×671656² = 902243564672, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671651) by changing a digit.

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, 240 + ... + 1183.

It is an arithmetic number, because the mean of its divisors is an integer number (80100).

2⁶⁷¹⁶⁵⁶ is an apocalyptic number.

It is an amenable number.

671656 is a deficient number, since it is larger than the sum of its proper divisors (609944).

671656 is a wasteful number, since it uses less digits than its factorization.

671656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1488 (or 1484 counting only the distinct ones).

The product of its digits is 7560, while the sum is 31.

The square root of 671656 is about 819.5462159024. The cubic root of 671656 is about 87.5754342687.

The spelling of 671656 in words is "six hundred seventy-one thousand, six hundred fifty-six".