876721681 has 8 divisors (see below), whose sum is σ = 957348000. Its totient is φ = 796249440.

The previous prime is 876721679. The next prime is 876721709. The reversal of 876721681 is 186127678.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 876721681 - 2¹ = 876721679 is a prime.

It is a super-2 number, since 2×876721681² = 1537281811870931522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (876721631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26451 + ... + 49528.

It is an arithmetic number, because the mean of its divisors is an integer number (119668500).

Almost surely, 2^876721681 is an apocalyptic number.

It is an amenable number.

876721681 is a deficient number, since it is larger than the sum of its proper divisors (80626319).

876721681 is a wasteful number, since it uses less digits than its factorization.

876721681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77039.

The product of its digits is 225792, while the sum is 46.

The square root of 876721681 is about 29609.4863346192. The cubic root of 876721681 is about 957.0925055809.

The spelling of 876721681 in words is "eight hundred seventy-six million, seven hundred twenty-one thousand, six hundred eighty-one".