876721664 has 160 divisors (see below), whose sum is σ = 2229190656. Its totient is φ = 335093760.

The previous prime is 876721661. The next prime is 876721673. The reversal of 876721664 is 466127678.

It is a happy number.

It is a super-2 number, since 2×876721664² = 1537281752253857792, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (876721661) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1444049 + ... + 1444655.

Almost surely, 2^876721664 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 876721664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1114595328).

876721664 is an abundant number, since it is smaller than the sum of its proper divisors (1352468992).

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

876721664 is a wasteful number, since it uses less digits than its factorization.

876721664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 676 (or 660 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 876721664 is about 29609.4860475490. The cubic root of 876721664 is about 957.0924993947.

The spelling of 876721664 in words is "eight hundred seventy-six million, seven hundred twenty-one thousand, six hundred sixty-four".