671657 has 8 divisors (see below), whose sum is σ = 772800. Its totient is φ = 571824.

The previous prime is 671651. The next prime is 671681. The reversal of 671657 is 756176.

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 671657 - 2⁸ = 671401 is a prime.

It is a super-2 number, since 2×671657² = 902246251298, 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 polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1394 + ... + 1812.

It is an arithmetic number, because the mean of its divisors is an integer number (96600).

2⁶⁷¹⁶⁵⁷ is an apocalyptic number.

It is an amenable number.

671657 is a deficient number, since it is larger than the sum of its proper divisors (101143).

671657 is a wasteful number, since it uses less digits than its factorization.

671657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 655.

The product of its digits is 8820, while the sum is 32.

The square root of 671657 is about 819.5468259959. The cubic root of 671657 is about 87.5754777311.

The spelling of 671657 in words is "six hundred seventy-one thousand, six hundred fifty-seven".