671813620 has 48 divisors (see below), whose sum is σ = 1442302848. Its totient is φ = 262793600.

The previous prime is 671813587. The next prime is 671813621. The reversal of 671813620 is 26318176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671813621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 165657 + ... + 169663.

It is an arithmetic number, because the mean of its divisors is an integer number (30047976).

Almost surely, 2^671813620 is an apocalyptic number.

It is an amenable number.

671813620 is an abundant number, since it is smaller than the sum of its proper divisors (770489228).

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

671813620 is a wasteful number, since it uses less digits than its factorization.

671813620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4200 (or 4198 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 671813620 is about 25919.3676620399. The cubic root of 671813620 is about 875.8228428335.

The spelling of 671813620 in words is "six hundred seventy-one million, eight hundred thirteen thousand, six hundred twenty".