64546409 has 4 divisors (see below), whose sum is σ = 64585104. Its totient is φ = 64507716.

The previous prime is 64546387. The next prime is 64546453. The reversal of 64546409 is 90464546.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90464546 = 2 ⋅45232273.

It is a cyclic number.

It is not a de Polignac number, because 64546409 - 2¹⁶ = 64480873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64546499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16727 + ... + 20220.

It is an arithmetic number, because the mean of its divisors is an integer number (16146276).

Almost surely, 2^64546409 is an apocalyptic number.

It is an amenable number.

64546409 is a deficient number, since it is larger than the sum of its proper divisors (38695).

64546409 is a wasteful number, since it uses less digits than its factorization.

64546409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38694.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 64546409 is about 8034.0779807020. The cubic root of 64546409 is about 401.1351277487.

The spelling of 64546409 in words is "sixty-four million, five hundred forty-six thousand, four hundred nine".