671042664 has 128 divisors (see below), whose sum is σ = 1955923200. Its totient is φ = 212762880.

The previous prime is 671042663. The next prime is 671042711. The reversal of 671042664 is 466240176.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (671042663) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1455394 + ... + 1455854.

It is an arithmetic number, because the mean of its divisors is an integer number (15280650).

Almost surely, 2^671042664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671042664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977961600).

671042664 is an abundant number, since it is smaller than the sum of its proper divisors (1284880536).

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

671042664 is a wasteful number, since it uses less digits than its factorization.

671042664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 671042664 is about 25904.4911936135. The cubic root of 671042664 is about 875.4876906877.

The spelling of 671042664 in words is "six hundred seventy-one million, forty-two thousand, six hundred sixty-four".