64855 has 16 divisors (see below), whose sum is σ = 95040. Its totient is φ = 41472.
The previous prime is 64853. The next prime is 64871. The reversal of 64855 is 55846.
It is a 9-Lehmer number, since φ(64855) divides (64855-1)9.
It is a cyclic number.
It is not a de Polignac number, because 64855 - 21 = 64853 is a prime.
It is a plaindrome in base 11 and base 13.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (64853) by changing a digit.
It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541 + ... + 649.
It is an arithmetic number, because the mean of its divisors is an integer number (5940).
264855 is an apocalyptic number.
64855 is a deficient number, since it is larger than the sum of its proper divisors (30185).
64855 is a wasteful number, since it uses less digits than its factorization.
64855 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 138.
The product of its digits is 4800, while the sum is 28.
The square root of 64855 is about 254.6664485165. Note that the first 3 decimals coincide. The cubic root of 64855 is about 40.1773376223.
Subtracting from 64855 its reverse (55846), we obtain a palindrome (9009).
It can be divided in two parts, 648 and 55, that added together give a triangular number (703 = T37).
The spelling of 64855 in words is "sixty-four thousand, eight hundred fifty-five".
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