671015664 has 200 divisors, whose sum is σ = 2141670960. Its totient is φ = 202815360.

The previous prime is 671015641. The next prime is 671015693. The reversal of 671015664 is 466510176.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1724782 + ... + 1725170.

Almost surely, 2^671015664 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 671015664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1070835480).

671015664 is an abundant number, since it is smaller than the sum of its proper divisors (1470655296).

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

671015664 is a wasteful number, since it uses less digits than its factorization.

671015664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 671015664 is about 25903.9700432192. The cubic root of 671015664 is about 875.4759485208.

The spelling of 671015664 in words is "six hundred seventy-one million, fifteen thousand, six hundred sixty-four".