64666287 has 12 divisors (see below), whose sum is σ = 106750800. Its totient is φ = 36952128.

The previous prime is 64666237. The next prime is 64666331. The reversal of 64666287 is 78266646.

It is not a de Polignac number, because 64666287 - 2⁶ = 64666223 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64666207) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 513162 + ... + 513287.

It is an arithmetic number, because the mean of its divisors is an integer number (8895900).

Almost surely, 2^64666287 is an apocalyptic number.

64666287 is a deficient number, since it is larger than the sum of its proper divisors (42084513).

64666287 is a wasteful number, since it uses less digits than its factorization.

64666287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1026462 (or 1026459 counting only the distinct ones).

The product of its digits is 580608, while the sum is 45.

The square root of 64666287 is about 8041.5351146407. The cubic root of 64666287 is about 401.3833085457.

The spelling of 64666287 in words is "sixty-four million, six hundred sixty-six thousand, two hundred eighty-seven".