18258664 has 8 divisors (see below), whose sum is σ = 34235010. Its totient is φ = 9129328.

The previous prime is 18258637. The next prime is 18258683. The reversal of 18258664 is 46685281.

It can be written as a sum of positive squares in only one way, i.e., 17156164 + 1102500 = 4142^2 + 1050^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18258664² = 666757622129792, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1141159 + ... + 1141174.

Almost surely, 2^18258664 is an apocalyptic number.

It is an amenable number.

18258664 is a deficient number, since it is larger than the sum of its proper divisors (15976346).

18258664 is a wasteful number, since it uses less digits than its factorization.

18258664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2282339 (or 2282335 counting only the distinct ones).

The product of its digits is 92160, while the sum is 40.

The square root of 18258664 is about 4273.0157968348. The cubic root of 18258664 is about 263.3235282717.

The spelling of 18258664 in words is "eighteen million, two hundred fifty-eight thousand, six hundred sixty-four".