64785871 has 4 divisors (see below), whose sum is σ = 67602672. Its totient is φ = 61969072.

The previous prime is 64785857. The next prime is 64785901. The reversal of 64785871 is 17858746.

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 64785871 - 2¹⁵ = 64753103 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 (64785811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1408366 + ... + 1408411.

It is an arithmetic number, because the mean of its divisors is an integer number (16900668).

Almost surely, 2^64785871 is an apocalyptic number.

64785871 is a deficient number, since it is larger than the sum of its proper divisors (2816801).

64785871 is a wasteful number, since it uses less digits than its factorization.

64785871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816800.

The product of its digits is 376320, while the sum is 46.

The square root of 64785871 is about 8048.9670765882. The cubic root of 64785871 is about 401.6305752787.

It can be divided in two parts, 64785 and 871, that added together give a palindrome (65656).

The spelling of 64785871 in words is "sixty-four million, seven hundred eighty-five thousand, eight hundred seventy-one".