64454221 has 4 divisors (see below), whose sum is σ = 69412252. Its totient is φ = 59496192.

The previous prime is 64454219. The next prime is 64454233. The reversal of 64454221 is 12245446.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24890121 + 39564100 = 4989^2 + 6290^2 .

It is a cyclic number.

It is not a de Polignac number, because 64454221 - 2¹ = 64454219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64454221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64454321) 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, 2478996 + ... + 2479021.

It is an arithmetic number, because the mean of its divisors is an integer number (17353063).

Almost surely, 2^64454221 is an apocalyptic number.

It is an amenable number.

64454221 is a deficient number, since it is larger than the sum of its proper divisors (4958031).

64454221 is a wasteful number, since it uses less digits than its factorization.

64454221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4958030.

The product of its digits is 7680, while the sum is 28.

The square root of 64454221 is about 8028.3386201630. The cubic root of 64454221 is about 400.9440638557.

Adding to 64454221 its reverse (12245446), we get a palindrome (76699667).

The spelling of 64454221 in words is "sixty-four million, four hundred fifty-four thousand, two hundred twenty-one".