64858687 has 4 divisors (see below), whose sum is σ = 64878280. Its totient is φ = 64839096.

The previous prime is 64858639. The next prime is 64858691. The reversal of 64858687 is 78685846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78685846 = 2 ⋅39342923.

It is a cyclic number.

It is not a de Polignac number, because 64858687 - 2⁷ = 64858559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64858627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3468 + ... + 11905.

It is an arithmetic number, because the mean of its divisors is an integer number (16219570).

Almost surely, 2^64858687 is an apocalyptic number.

64858687 is a deficient number, since it is larger than the sum of its proper divisors (19593).

64858687 is a wasteful number, since it uses less digits than its factorization.

64858687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19592.

The product of its digits is 2580480, while the sum is 52.

The square root of 64858687 is about 8053.4891196301. The cubic root of 64858687 is about 401.7809896704.

The spelling of 64858687 in words is "sixty-four million, eight hundred fifty-eight thousand, six hundred eighty-seven".