671742 has 24 divisors (see below), whose sum is σ = 1479816. Its totient is φ = 220176.

The previous prime is 671729. The next prime is 671743. The reversal of 671742 is 247176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671743) by changing a digit.

671742 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 928 + ... + 1484.

It is an arithmetic number, because the mean of its divisors is an integer number (61659).

671742 is a Friedman number, since it can be written as 4^7*(7*6-1)-2, using all its digits and the basic arithmetic operations.

2⁶⁷¹⁷⁴² is an apocalyptic number.

671742 is an abundant number, since it is smaller than the sum of its proper divisors (808074).

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

671742 is a wasteful number, since it uses less digits than its factorization.

671742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632 (or 629 counting only the distinct ones).

The product of its digits is 2352, while the sum is 27.

The square root of 671742 is about 819.5986822830. The cubic root of 671742 is about 87.5791718794.

It can be divided in two parts, 67174 and 2, that added together give a palindrome (67176).

The spelling of 671742 in words is "six hundred seventy-one thousand, seven hundred forty-two".