671634 has 12 divisors (see below), whose sum is σ = 1455246. Its totient is φ = 223872.

The previous prime is 671633. The next prime is 671647. The reversal of 671634 is 436176.

It can be written as a sum of positive squares in only one way, i.e., 363609 + 308025 = 603^2 + 555^2 .

It is a junction number, because it is equal to n+sod(n) for n = 671598 and 671607.

It is not an unprimeable number, because it can be changed into a prime (671633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 18639 + ... + 18674.

2⁶⁷¹⁶³⁴ is an apocalyptic number.

671634 is an abundant number, since it is smaller than the sum of its proper divisors (783612).

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

671634 is a wasteful number, since it uses less digits than its factorization.

671634 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37321 (or 37318 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 671634 is about 819.5327937307. The cubic root of 671634 is about 87.5744780845.

The spelling of 671634 in words is "six hundred seventy-one thousand, six hundred thirty-four".