671725 has 12 divisors (see below), whose sum is σ = 844564. Its totient is φ = 529920.

The previous prime is 671717. The next prime is 671729. The reversal of 671725 is 527176.

It can be written as a sum of positive squares in 6 ways, for example, as 77284 + 594441 = 278^2 + 771^2 .

It is not a de Polignac number, because 671725 - 2³ = 671717 is a prime.

It is a Duffinian number.

671725 is a Rhonda number in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 671693 and 671702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2287 + ... + 2563.

2⁶⁷¹⁷²⁵ is an apocalyptic number.

It is an amenable number.

671725 is a deficient number, since it is larger than the sum of its proper divisors (172839).

671725 is a wasteful number, since it uses less digits than its factorization.

671725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 384 (or 379 counting only the distinct ones).

The product of its digits is 2940, while the sum is 28.

The square root of 671725 is about 819.5883112881. The cubic root of 671725 is about 87.5784330747.

The spelling of 671725 in words is "six hundred seventy-one thousand, seven hundred twenty-five".