64189018 has 4 divisors (see below), whose sum is σ = 96283530. Its totient is φ = 32094508.

The previous prime is 64189007. The next prime is 64189031. The reversal of 64189018 is 81098146.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81098146 = 2 ⋅40549073.

It can be written as a sum of positive squares in only one way, i.e., 37491129 + 26697889 = 6123^2 + 5167^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16047253 + ... + 16047256.

Almost surely, 2^64189018 is an apocalyptic number.

64189018 is a deficient number, since it is larger than the sum of its proper divisors (32094512).

64189018 is a wasteful number, since it uses less digits than its factorization.

64189018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32094511.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 64189018 is about 8011.8049152485. The cubic root of 64189018 is about 400.3934004633.

The spelling of 64189018 in words is "sixty-four million, one hundred eighty-nine thousand, eighteen".