671558720 has 84 divisors (see below), whose sum is σ = 1860278220. Its totient is φ = 230243328.

The previous prime is 671558687. The next prime is 671558729. The reversal of 671558720 is 27855176.

It can be written as a sum of positive squares in 2 ways, for example, as 404170816 + 267387904 = 20104^2 + 16352^2 .

It is a super-2 number, since 2×671558720² = 901982228816076800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (671558729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5735 + ... + 37094.

Almost surely, 2^671558720 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 671558720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (930139110).

671558720 is an abundant number, since it is smaller than the sum of its proper divisors (1188719500).

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

671558720 is a wasteful number, since it uses less digits than its factorization.

671558720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42860 (or 42843 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 41.

The square root of 671558720 is about 25914.4500231049. The cubic root of 671558720 is about 875.7120603800.

The spelling of 671558720 in words is "six hundred seventy-one million, five hundred fifty-eight thousand, seven hundred twenty".