64686723 has 8 divisors (see below), whose sum is σ = 86687568. Its totient is φ = 42905184.

The previous prime is 64686709. The next prime is 64686757. The reversal of 64686723 is 32768646.

64686723 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64686723 - 2⁴ = 64686707 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (64686793) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 54136 + ... + 55317.

It is an arithmetic number, because the mean of its divisors is an integer number (10835946).

Almost surely, 2^64686723 is an apocalyptic number.

64686723 is a deficient number, since it is larger than the sum of its proper divisors (22000845).

64686723 is a wasteful number, since it uses less digits than its factorization.

64686723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109653.

The product of its digits is 290304, while the sum is 42.

The square root of 64686723 is about 8042.8056671786. The cubic root of 64686723 is about 401.4255861412.

The spelling of 64686723 in words is "sixty-four million, six hundred eighty-six thousand, seven hundred twenty-three".