64989 has 16 divisors (see below), whose sum is σ = 100800. Its totient is φ = 41328.

The previous prime is 64969. The next prime is 64997. The reversal of 64989 is 98946.

64989 is a `hidden beast` number, since 649 + 8 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-64989 is a prime.

It is a nialpdrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64919) 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 15 ways as a sum of consecutive naturals, for example, 742 + ... + 824.

It is an arithmetic number, because the mean of its divisors is an integer number (6300).

2⁶⁴⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

64989 is a deficient number, since it is larger than the sum of its proper divisors (35811).

64989 is a wasteful number, since it uses less digits than its factorization.

64989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121 (or 115 counting only the distinct ones).

The product of its digits is 15552, while the sum is 36.

The square root of 64989 is about 254.9294019920. The cubic root of 64989 is about 40.2049893562.

Adding to 64989 its sum of digits (36), we get a square (65025 = 255²).

The spelling of 64989 in words is "sixty-four thousand, nine hundred eighty-nine".