64670221 has 8 divisors (see below), whose sum is σ = 80627904. Its totient is φ = 50392320.

The previous prime is 64670153. The next prime is 64670233. The reversal of 64670221 is 12207646.

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

It is not a de Polignac number, because 64670221 - 2¹⁷ = 64539149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64670221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64670251) 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, 419860 + ... + 420013.

It is an arithmetic number, because the mean of its divisors is an integer number (10078488).

Almost surely, 2^64670221 is an apocalyptic number.

It is an amenable number.

64670221 is a deficient number, since it is larger than the sum of its proper divisors (15957683).

64670221 is a wasteful number, since it uses less digits than its factorization.

64670221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 839891.

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 64670221 is about 8041.7797159584. The cubic root of 64670221 is about 401.3914478199.

Adding to 64670221 its reverse (12207646), we get a palindrome (76877867).

The spelling of 64670221 in words is "sixty-four million, six hundred seventy thousand, two hundred twenty-one".