671240 has 32 divisors (see below), whose sum is σ = 1534680. Its totient is φ = 264192.

The previous prime is 671233. The next prime is 671249. The reversal of 671240 is 42176.

It can be written as a sum of positive squares in 4 ways, for example, as 630436 + 40804 = 794^2 + 202^2 .

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (671249) 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, 3794 + ... + 3966.

2⁶⁷¹²⁴⁰ is an apocalyptic number.

It is an amenable number.

671240 is an abundant number, since it is smaller than the sum of its proper divisors (863440).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

671240 is a wasteful number, since it uses less digits than its factorization.

671240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 671240 is about 819.2923776040. The cubic root of 671240 is about 87.5573501579.

The spelling of 671240 in words is "six hundred seventy-one thousand, two hundred forty".