64689405 has 32 divisors (see below), whose sum is σ = 116563968. Its totient is φ = 30350400.

The previous prime is 64689367. The next prime is 64689407. The reversal of 64689405 is 50498646.

It is not a de Polignac number, because 64689405 - 2¹⁰ = 64688381 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64689407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1209 + ... + 11438.

It is an arithmetic number, because the mean of its divisors is an integer number (3642624).

Almost surely, 2^64689405 is an apocalyptic number.

It is an amenable number.

64689405 is a deficient number, since it is larger than the sum of its proper divisors (51874563).

64689405 is a wasteful number, since it uses less digits than its factorization.

64689405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12697.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 64689405 is about 8042.9723983115. The cubic root of 64689405 is about 401.4311339491.

The spelling of 64689405 in words is "sixty-four million, six hundred eighty-nine thousand, four hundred five".