671655 has 8 divisors (see below), whose sum is σ = 1074672. Its totient is φ = 358208.

The previous prime is 671651. The next prime is 671681. The reversal of 671655 is 556176.

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

It is a cyclic number.

It is not a de Polignac number, because 671655 - 2² = 671651 is a prime.

It is a super-2 number, since 2×671655² = 902240878050, which contains 22 as substring.

It is a congruent number.

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 (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22374 + ... + 22403.

It is an arithmetic number, because the mean of its divisors is an integer number (134334).

2⁶⁷¹⁶⁵⁵ is an apocalyptic number.

671655 is a deficient number, since it is larger than the sum of its proper divisors (403017).

671655 is a wasteful number, since it uses less digits than its factorization.

671655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44785.

The product of its digits is 6300, while the sum is 30.

The square root of 671655 is about 819.5456058085. The cubic root of 671655 is about 87.5753908062.

It can be divided in two parts, 671 and 655, that added together give a triangular number (1326 = T₅₁).

The spelling of 671655 in words is "six hundred seventy-one thousand, six hundred fifty-five".