671609814 has 16 divisors (see below), whose sum is σ = 1343893680. Its totient is φ = 223757600.

The previous prime is 671609801. The next prime is 671609833. The reversal of 671609814 is 418906176.

It is a super-2 number, since 2×671609814² = 902119484522229192, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14637 + ... + 39464.

It is an arithmetic number, because the mean of its divisors is an integer number (83993355).

Almost surely, 2^671609814 is an apocalyptic number.

671609814 is an abundant number, since it is smaller than the sum of its proper divisors (672283866).

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

671609814 is a wasteful number, since it uses less digits than its factorization.

671609814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56175.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 671609814 is about 25915.4358250059. The cubic root of 671609814 is about 875.7342686625.

The spelling of 671609814 in words is "six hundred seventy-one million, six hundred nine thousand, eight hundred fourteen".