64987 has 4 divisors (see below), whose sum is σ = 70000. Its totient is φ = 59976.

The previous prime is 64969. The next prime is 64997. The reversal of 64987 is 78946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64987 - 2¹¹ = 62939 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (64927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2487 + ... + 2512.

It is an arithmetic number, because the mean of its divisors is an integer number (17500).

2⁶⁴⁹⁸⁷ is an apocalyptic number.

64987 is a deficient number, since it is larger than the sum of its proper divisors (5013).

64987 is a wasteful number, since it uses less digits than its factorization.

64987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5012.

The product of its digits is 12096, while the sum is 34.

The square root of 64987 is about 254.9254793072. The cubic root of 64987 is about 40.2045769233.

The spelling of 64987 in words is "sixty-four thousand, nine hundred eighty-seven".