64904223 has 4 divisors (see below), whose sum is σ = 86538968. Its totient is φ = 43269480.

The previous prime is 64904221. The next prime is 64904263. The reversal of 64904223 is 32240946.

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

It is not a de Polignac number, because 64904223 - 2¹ = 64904221 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 (64904221) 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, 10817368 + ... + 10817373.

It is an arithmetic number, because the mean of its divisors is an integer number (21634742).

Almost surely, 2^64904223 is an apocalyptic number.

64904223 is a deficient number, since it is larger than the sum of its proper divisors (21634745).

64904223 is a wasteful number, since it uses less digits than its factorization.

64904223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21634744.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 64904223 is about 8056.3157212215. The cubic root of 64904223 is about 401.8749951667.

The spelling of 64904223 in words is "sixty-four million, nine hundred four thousand, two hundred twenty-three".