8723665 has 4 divisors (see below), whose sum is σ = 10468404. Its totient is φ = 6978928.

The previous prime is 8723653. The next prime is 8723677. The reversal of 8723665 is 5663278.

8723665 = 2088² + 2089².

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (8723653) and next prime (8723677).

It can be written as a sum of positive squares in 2 ways, for example, as 4359744 + 4363921 = 2088^2 + 2089^2 .

It is a cyclic number.

It is not a de Polignac number, because 8723665 - 2¹¹ = 8721617 is a prime.

It is a super-2 number, since 2×8723665² = 152204662064450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 872362 + ... + 872371.

It is an arithmetic number, because the mean of its divisors is an integer number (2617101).

Almost surely, 2^8723665 is an apocalyptic number.

8723665 is the 2089-th centered square number.

It is an amenable number.

8723665 is a deficient number, since it is larger than the sum of its proper divisors (1744739).

8723665 is a wasteful number, since it uses less digits than its factorization.

8723665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744738.

The product of its digits is 60480, while the sum is 37.

The square root of 8723665 is about 2953.5851096591. The cubic root of 8723665 is about 205.8573257213.

The spelling of 8723665 in words is "eight million, seven hundred twenty-three thousand, six hundred sixty-five".