64909023 has 4 divisors (see below), whose sum is σ = 86545368. Its totient is φ = 43272680.

The previous prime is 64909003. The next prime is 64909049. The reversal of 64909023 is 32090946.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64909023 - 2⁹ = 64908511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64909003) 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, 10818168 + ... + 10818173.

It is an arithmetic number, because the mean of its divisors is an integer number (21636342).

Almost surely, 2^64909023 is an apocalyptic number.

64909023 is a deficient number, since it is larger than the sum of its proper divisors (21636345).

64909023 is a wasteful number, since it uses less digits than its factorization.

64909023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21636344.

The product of its (nonzero) digits is 11664, while the sum is 33.

The square root of 64909023 is about 8056.6136186366. The cubic root of 64909023 is about 401.8849018278.

Adding to 64909023 its reverse (32090946), we get a palindrome (96999969).

The spelling of 64909023 in words is "sixty-four million, nine hundred nine thousand, twenty-three".