671642 has 4 divisors (see below), whose sum is σ = 1007466. Its totient is φ = 335820.

The previous prime is 671633. The next prime is 671647. The reversal of 671642 is 246176.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 654481 + 17161 = 809^2 + 131^2 .

It is a super-2 number, since 2×671642² = 902205952328, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167909 + ... + 167912.

2⁶⁷¹⁶⁴² is an apocalyptic number.

671642 is a deficient number, since it is larger than the sum of its proper divisors (335824).

671642 is a wasteful number, since it uses less digits than its factorization.

671642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 335823.

The product of its digits is 2016, while the sum is 26.

The square root of 671642 is about 819.5376745458. The cubic root of 671642 is about 87.5748257903.

The spelling of 671642 in words is "six hundred seventy-one thousand, six hundred forty-two".