868677721 has 4 divisors (see below), whose sum is σ = 873879552. Its totient is φ = 863475892.

The previous prime is 868677671. The next prime is 868677737. The reversal of 868677721 is 127776868.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 868677721 - 2²¹ = 866580569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (868677421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2600665 + ... + 2600998.

It is an arithmetic number, because the mean of its divisors is an integer number (218469888).

Almost surely, 2^868677721 is an apocalyptic number.

It is an amenable number.

868677721 is a deficient number, since it is larger than the sum of its proper divisors (5201831).

868677721 is a wasteful number, since it uses less digits than its factorization.

868677721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201830.

The product of its digits is 1580544, while the sum is 52.

The square root of 868677721 is about 29473.3391559219. The cubic root of 868677721 is about 954.1563855603.

The spelling of 868677721 in words is "eight hundred sixty-eight million, six hundred seventy-seven thousand, seven hundred twenty-one".