64561479 has 4 divisors (see below), whose sum is σ = 86081976. Its totient is φ = 43040984.

The previous prime is 64561477. The next prime is 64561489. The reversal of 64561479 is 97416546.

64561479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 64561479 - 2¹ = 64561477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64561479.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64561477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10760244 + ... + 10760249.

It is an arithmetic number, because the mean of its divisors is an integer number (21520494).

Almost surely, 2^64561479 is an apocalyptic number.

64561479 is a deficient number, since it is larger than the sum of its proper divisors (21520497).

64561479 is a wasteful number, since it uses less digits than its factorization.

64561479 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21520496.

The product of its digits is 181440, while the sum is 42.

The square root of 64561479 is about 8035.0158058339. The cubic root of 64561479 is about 401.1663437170.

The spelling of 64561479 in words is "sixty-four million, five hundred sixty-one thousand, four hundred seventy-nine".