671637976 has 16 divisors (see below), whose sum is σ = 1269239040. Its totient is φ = 333174240.

The previous prime is 671637961. The next prime is 671637977. The reversal of 671637976 is 679736176.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671637977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 329515 + ... + 331546.

It is an arithmetic number, because the mean of its divisors is an integer number (79327440).

Almost surely, 2^671637976 is an apocalyptic number.

It is an amenable number.

671637976 is a deficient number, since it is larger than the sum of its proper divisors (597601064).

671637976 is a wasteful number, since it uses less digits than its factorization.

671637976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661194 (or 661190 counting only the distinct ones).

The product of its digits is 2000376, while the sum is 52.

The square root of 671637976 is about 25915.9791634428. The cubic root of 671637976 is about 875.7465089461.

The spelling of 671637976 in words is "six hundred seventy-one million, six hundred thirty-seven thousand, nine hundred seventy-six".