64811868 has 48 divisors (see below), whose sum is σ = 170674560. Its totient is φ = 18961600.

The previous prime is 64811849. The next prime is 64811881. The reversal of 64811868 is 86811846.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 4638 + ... + 12293.

It is an arithmetic number, because the mean of its divisors is an integer number (3555720).

Almost surely, 2^64811868 is an apocalyptic number.

It is an amenable number.

64811868 is an abundant number, since it is smaller than the sum of its proper divisors (105862692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64811868 is a wasteful number, since it uses less digits than its factorization.

64811868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16978 (or 16976 counting only the distinct ones).

The product of its digits is 73728, while the sum is 42.

The square root of 64811868 is about 8050.5818423267. The cubic root of 64811868 is about 401.6842896335.

The spelling of 64811868 in words is "sixty-four million, eight hundred eleven thousand, eight hundred sixty-eight".