18064615 has 4 divisors (see below), whose sum is σ = 21677544. Its totient is φ = 14451688.

The previous prime is 18064609. The next prime is 18064619. The reversal of 18064615 is 51646081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51646081 = 233 ⋅221657.

It is a cyclic number.

It is not a de Polignac number, because 18064615 - 2²¹ = 15967463 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18064619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1806457 + ... + 1806466.

It is an arithmetic number, because the mean of its divisors is an integer number (5419386).

Almost surely, 2^18064615 is an apocalyptic number.

18064615 is a deficient number, since it is larger than the sum of its proper divisors (3612929).

18064615 is an equidigital number, since it uses as much as digits as its factorization.

18064615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3612928.

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 18064615 is about 4250.2488162459. The cubic root of 18064615 is about 262.3873560531.

The spelling of 18064615 in words is "eighteen million, sixty-four thousand, six hundred fifteen".