64871811 has 24 divisors (see below), whose sum is σ = 97500000. Its totient is φ = 41513472.

The previous prime is 64871803. The next prime is 64871827. The reversal of 64871811 is 11817846.

64871811 is a `hidden beast` number, since 648 + 7 + 1 + 8 + 1 + 1 = 666.

It is not a de Polignac number, because 64871811 - 2³ = 64871803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64871861) 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 23 ways as a sum of consecutive naturals, for example, 51315 + ... + 52563.

It is an arithmetic number, because the mean of its divisors is an integer number (4062500).

Almost surely, 2^64871811 is an apocalyptic number.

64871811 is a deficient number, since it is larger than the sum of its proper divisors (32628189).

64871811 is a wasteful number, since it uses less digits than its factorization.

64871811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1483 (or 1480 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 64871811 is about 8054.3038805349. The cubic root of 64871811 is about 401.8080876498.

The spelling of 64871811 in words is "sixty-four million, eight hundred seventy-one thousand, eight hundred eleven".