671908446 has 80 divisors (see below), whose sum is σ = 1695564288. Its totient is φ = 197024400.

The previous prime is 671908441. The next prime is 671908487. The reversal of 671908446 is 644809176.

It is a super-2 number, since 2×671908446² = 902921919612269832, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671908441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 49161 + ... + 61323.

Almost surely, 2^671908446 is an apocalyptic number.

671908446 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 671908446, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (847782144).

671908446 is an abundant number, since it is smaller than the sum of its proper divisors (1023655842).

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

671908446 is a wasteful number, since it uses less digits than its factorization.

671908446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12219 (or 12210 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 671908446 is about 25921.1968473680. The cubic root of 671908446 is about 875.8640481456.

The spelling of 671908446 in words is "six hundred seventy-one million, nine hundred eight thousand, four hundred forty-six".