64873911 has 4 divisors (see below), whose sum is σ = 86498552. Its totient is φ = 43249272.

The previous prime is 64873909. The next prime is 64873933. The reversal of 64873911 is 11937846.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 64873911 - 2¹ = 64873909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64873911.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64873811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10812316 + ... + 10812321.

It is an arithmetic number, because the mean of its divisors is an integer number (21624638).

Almost surely, 2^64873911 is an apocalyptic number.

64873911 is a deficient number, since it is larger than the sum of its proper divisors (21624641).

64873911 is a wasteful number, since it uses less digits than its factorization.

64873911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21624640.

The product of its digits is 36288, while the sum is 39.

The square root of 64873911 is about 8054.4342445637. The cubic root of 64873911 is about 401.8124233176.

The spelling of 64873911 in words is "sixty-four million, eight hundred seventy-three thousand, nine hundred eleven".