8700661 has 8 divisors (see below), whose sum is σ = 9019224. Its totient is φ = 8386560.

The previous prime is 8700649. The next prime is 8700697. The reversal of 8700661 is 1660078.

It can be written as a sum of positive squares in 4 ways, for example, as 463761 + 8236900 = 681^2 + 2870^2 .

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 8700661 - 2¹³ = 8692469 is a prime.

It is a Duffinian number.

8700661 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8700161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3141 + ... + 5221.

It is an arithmetic number, because the mean of its divisors is an integer number (1127403).

Almost surely, 2^8700661 is an apocalyptic number.

It is an amenable number.

8700661 is a deficient number, since it is larger than the sum of its proper divisors (318563).

8700661 is a wasteful number, since it uses less digits than its factorization.

8700661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 8700661 is about 2949.6882886163. The cubic root of 8700661 is about 205.6762202450.

The spelling of 8700661 in words is "eight million, seven hundred thousand, six hundred sixty-one".