64509205 has 16 divisors (see below), whose sum is σ = 78825600. Its totient is φ = 50673600.

The previous prime is 64509191. The next prime is 64509229. The reversal of 64509205 is 50290546.

64509205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64509205 - 2⁷ = 64509077 is a prime.

It is a super-2 number, since 2×64509205² = 8322875059464050, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 69736 + ... + 70654.

It is an arithmetic number, because the mean of its divisors is an integer number (4926600).

Almost surely, 2^64509205 is an apocalyptic number.

It is an amenable number.

64509205 is a deficient number, since it is larger than the sum of its proper divisors (14316395).

64509205 is a wasteful number, since it uses less digits than its factorization.

64509205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1164.

The product of its (nonzero) digits is 10800, while the sum is 31.

The square root of 64509205 is about 8031.7622599278. The cubic root of 64509205 is about 401.0580426468.

The spelling of 64509205 in words is "sixty-four million, five hundred nine thousand, two hundred five".