671656560 has 160 divisors (see below), whose sum is σ = 2189383680. Its totient is φ = 170118144.

The previous prime is 671656537. The next prime is 671656561. The reversal of 671656560 is 65656176.

It is a super-2 number, since 2×671656560² = 902245069182067200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671656561) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380961 + ... + 382719.

It is an arithmetic number, because the mean of its divisors is an integer number (13683648).

Almost surely, 2^671656560 is an apocalyptic number.

671656560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671656560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1094691840).

671656560 is an abundant number, since it is smaller than the sum of its proper divisors (1517727120).

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

671656560 is a wasteful number, since it uses less digits than its factorization.

671656560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855 (or 1849 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 671656560 is about 25916.3377042359. The cubic root of 671656560 is about 875.7545860767.

It can be divided in two parts, 671 and 656560, that added together give a triangular number (657231 = T₁₁₄₆).

The spelling of 671656560 in words is "six hundred seventy-one million, six hundred fifty-six thousand, five hundred sixty".