671841940 has 72 divisors (see below), whose sum is σ = 1790443872. Its totient is φ = 209401920.

The previous prime is 671841931. The next prime is 671841941. The reversal of 671841940 is 49148176.

It is a junction number, because it is equal to n+sod(n) for n = 671841893 and 671841902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671841941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20382 + ... + 41941.

It is an arithmetic number, because the mean of its divisors is an integer number (24867276).

Almost surely, 2^671841940 is an apocalyptic number.

It is an amenable number.

671841940 is an abundant number, since it is smaller than the sum of its proper divisors (1118601932).

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

671841940 is a wasteful number, since it uses less digits than its factorization.

671841940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62357 (or 62348 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 671841940 is about 25919.9139659066. The cubic root of 671841940 is about 875.8351492995.

The spelling of 671841940 in words is "six hundred seventy-one million, eight hundred forty-one thousand, nine hundred forty".