671770220 has 72 divisors (see below), whose sum is σ = 1568548800. Its totient is φ = 241457920.

The previous prime is 671770193. The next prime is 671770243. The reversal of 671770220 is 22077176.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 213821 + ... + 216939.

It is an arithmetic number, because the mean of its divisors is an integer number (21785400).

Almost surely, 2^671770220 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 671770220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (784274400).

671770220 is an abundant number, since it is smaller than the sum of its proper divisors (896778580).

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

671770220 is a wasteful number, since it uses less digits than its factorization.

671770220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239 (or 3226 counting only the distinct ones).

The product of its (nonzero) digits is 8232, while the sum is 32.

The square root of 671770220 is about 25918.5304367358. The cubic root of 671770220 is about 875.8039826771.

The spelling of 671770220 in words is "six hundred seventy-one million, seven hundred seventy thousand, two hundred twenty".