8670661 has 4 divisors (see below), whose sum is σ = 8690092. Its totient is φ = 8651232.

The previous prime is 8670653. The next prime is 8670667. The reversal of 8670661 is 1660768.

8670661 is nontrivially palindromic in base 3.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5452225 + 3218436 = 2335^2 + 1794^2 .

It is a cyclic number.

It is not a de Polignac number, because 8670661 - 2³ = 8670653 is a prime.

It is an Ulam number.

It is a Duffinian number.

8670661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8670667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9030 + ... + 9943.

It is an arithmetic number, because the mean of its divisors is an integer number (2172523).

Almost surely, 2^8670661 is an apocalyptic number.

It is an amenable number.

8670661 is a deficient number, since it is larger than the sum of its proper divisors (19431).

8670661 is a wasteful number, since it uses less digits than its factorization.

8670661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19430.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 8670661 is about 2944.5986144125. The cubic root of 8670661 is about 205.4395565414.

The spelling of 8670661 in words is "eight million, six hundred seventy thousand, six hundred sixty-one".