8661615 has 16 divisors (see below), whose sum is σ = 14003808. Its totient is φ = 4571136.

The previous prime is 8661581. The next prime is 8661623. The reversal of 8661615 is 5161668.

It is not a de Polignac number, because 8661615 - 2⁷ = 8661487 is a prime.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 1522 + ... + 4431.

It is an arithmetic number, because the mean of its divisors is an integer number (875238).

Almost surely, 2^8661615 is an apocalyptic number.

8661615 is a deficient number, since it is larger than the sum of its proper divisors (5342193).

8661615 is a wasteful number, since it uses less digits than its factorization.

8661615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6058.

The product of its digits is 8640, while the sum is 33.

The square root of 8661615 is about 2943.0621807906. The cubic root of 8661615 is about 205.3680874462.

The spelling of 8661615 in words is "eight million, six hundred sixty-one thousand, six hundred fifteen".