64209545 has 4 divisors (see below), whose sum is σ = 77051460. Its totient is φ = 51367632.

The previous prime is 64209529. The next prime is 64209557. The reversal of 64209545 is 54590246.

It is a happy number.

64209545 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, and also an emirpimes, since its reverse is a distinct semiprime: 54590246 = 2 ⋅27295123.

It can be written as a sum of positive squares in 2 ways, for example, as 27206656 + 37002889 = 5216^2 + 6083^2 .

It is a cyclic number.

It is not a de Polignac number, because 64209545 - 2⁴ = 64209529 is a prime.

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 3 ways as a sum of consecutive naturals, for example, 6420950 + ... + 6420959.

It is an arithmetic number, because the mean of its divisors is an integer number (19262865).

Almost surely, 2^64209545 is an apocalyptic number.

It is an amenable number.

64209545 is a deficient number, since it is larger than the sum of its proper divisors (12841915).

64209545 is a wasteful number, since it uses less digits than its factorization.

64209545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12841914.

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 64209545 is about 8013.0858600167. The cubic root of 64209545 is about 400.4360765038.

The spelling of 64209545 in words is "sixty-four million, two hundred nine thousand, five hundred forty-five".