64723189 has 4 divisors (see below), whose sum is σ = 64802656. Its totient is φ = 64643724.

The previous prime is 64723171. The next prime is 64723193. The reversal of 64723189 is 98132746.

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: 98132746 = 2 ⋅49066373.

It is a cyclic number.

It is not a de Polignac number, because 64723189 - 2¹¹ = 64721141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64723159) 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 3 ways as a sum of consecutive naturals, for example, 38499 + ... + 40144.

It is an arithmetic number, because the mean of its divisors is an integer number (16200664).

Almost surely, 2^64723189 is an apocalyptic number.

It is an amenable number.

64723189 is a deficient number, since it is larger than the sum of its proper divisors (79467).

64723189 is an equidigital number, since it uses as much as digits as its factorization.

64723189 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79466.

The product of its digits is 72576, while the sum is 40.

The square root of 64723189 is about 8045.0723427450. The cubic root of 64723189 is about 401.5010041708.

The spelling of 64723189 in words is "sixty-four million, seven hundred twenty-three thousand, one hundred eighty-nine".