8677721 has 8 divisors (see below), whose sum is σ = 9598344. Its totient is φ = 7793280.

The previous prime is 8677681. The next prime is 8677723. The reversal of 8677721 is 1277768.

It can be written as a sum of positive squares in 4 ways, for example, as 151321 + 8526400 = 389^2 + 2920^2 .

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 8677721 - 2¹⁸ = 8415577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8677723) 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, 8540 + ... + 9501.

It is an arithmetic number, because the mean of its divisors is an integer number (1199793).

Almost surely, 2^8677721 is an apocalyptic number.

It is an amenable number.

8677721 is a deficient number, since it is larger than the sum of its proper divisors (920623).

8677721 is a wasteful number, since it uses less digits than its factorization.

8677721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18091.

The product of its digits is 32928, while the sum is 38.

The square root of 8677721 is about 2945.7971756385. The cubic root of 8677721 is about 205.4953004571.

The spelling of 8677721 in words is "eight million, six hundred seventy-seven thousand, seven hundred twenty-one".