64687 has 4 divisors (see below), whose sum is σ = 73936. Its totient is φ = 55440.

The previous prime is 64679. The next prime is 64693. The reversal of 64687 is 78646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78646 = 2 ⋅39323.

It is not a de Polignac number, because 64687 - 2³ = 64679 is a prime.

It is a d-powerful number, because it can be written as 6⁴ + 4⁷ + 6⁶ + 8 + 7³ .

It is a Duffinian number.

It is a plaindrome in base 11 and base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 64687.

It is not an unprimeable number, because it can be changed into a prime (64627) 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, 4614 + ... + 4627.

It is an arithmetic number, because the mean of its divisors is an integer number (18484).

2⁶⁴⁶⁸⁷ is an apocalyptic number.

64687 is a deficient number, since it is larger than the sum of its proper divisors (9249).

64687 is an equidigital number, since it uses as much as digits as its factorization.

64687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9248.

The product of its digits is 8064, while the sum is 31.

The square root of 64687 is about 254.3363914189. The cubic root of 64687 is about 40.1426159132.

The spelling of 64687 in words is "sixty-four thousand, six hundred eighty-seven".