64439221 has 8 divisors (see below), whose sum is σ = 80339904. Its totient is φ = 50212320.

The previous prime is 64439191. The next prime is 64439227. The reversal of 64439221 is 12293446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64439221 - 2¹⁵ = 64406453 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 (64439227) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 418360 + ... + 418513.

It is an arithmetic number, because the mean of its divisors is an integer number (10042488).

Almost surely, 2^64439221 is an apocalyptic number.

It is an amenable number.

64439221 is a deficient number, since it is larger than the sum of its proper divisors (15900683).

64439221 is a wasteful number, since it uses less digits than its factorization.

64439221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 836891.

The product of its digits is 10368, while the sum is 31.

The square root of 64439221 is about 8027.4043750144. The cubic root of 64439221 is about 400.9129584320.

The spelling of 64439221 in words is "sixty-four million, four hundred thirty-nine thousand, two hundred twenty-one".