671637 has 8 divisors (see below), whose sum is σ = 902880. Its totient is φ = 444080.

The previous prime is 671633. The next prime is 671647. The reversal of 671637 is 736176.

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 671637 - 2² = 671633 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671633) 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, 462 + ... + 1247.

It is an arithmetic number, because the mean of its divisors is an integer number (112860).

2⁶⁷¹⁶³⁷ is an apocalyptic number.

It is an amenable number.

671637 is a deficient number, since it is larger than the sum of its proper divisors (231243).

671637 is a wasteful number, since it uses less digits than its factorization.

671637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843.

The product of its digits is 5292, while the sum is 30.

The square root of 671637 is about 819.5346240398. The cubic root of 671637 is about 87.5746084745.

The spelling of 671637 in words is "six hundred seventy-one thousand, six hundred thirty-seven".