64688905 has 4 divisors (see below), whose sum is σ = 77626692. Its totient is φ = 51751120.

The previous prime is 64688843. The next prime is 64688917. The reversal of 64688905 is 50988646.

64688905 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: 50988646 = 2 ⋅25494323.

It can be written as a sum of positive squares in 2 ways, for example, as 11923209 + 52765696 = 3453^2 + 7264^2 .

It is not a de Polignac number, because 64688905 - 2¹¹ = 64686857 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 6468886 + ... + 6468895.

It is an arithmetic number, because the mean of its divisors is an integer number (19406673).

Almost surely, 2^64688905 is an apocalyptic number.

It is an amenable number.

64688905 is a deficient number, since it is larger than the sum of its proper divisors (12937787).

64688905 is a wasteful number, since it uses less digits than its factorization.

64688905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12937786.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 64688905 is about 8042.9413152155. The cubic root of 64688905 is about 401.4300996938.

The spelling of 64688905 in words is "sixty-four million, six hundred eighty-eight thousand, nine hundred five".