671660 has 48 divisors (see below), whose sum is σ = 1596672. Its totient is φ = 235200.

The previous prime is 671651. The next prime is 671681. The reversal of 671660 is 66176.

It is a super-2 number, since 2×671660² = 902254311200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors.

It is an Ulam number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9425 + ... + 9495.

It is an arithmetic number, because the mean of its divisors is an integer number (33264).

2⁶⁷¹⁶⁶⁰ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (798336).

671660 is an abundant number, since it is smaller than the sum of its proper divisors (925012).

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

671660 is a wasteful number, since it uses less digits than its factorization.

671660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 671660 is about 819.5486562737. The cubic root of 671660 is about 87.5756081181.

It can be divided in two parts, 6716 and 60, that added together give a palindrome (6776).

The spelling of 671660 in words is "six hundred seventy-one thousand, six hundred sixty".