64221284 has 6 divisors (see below), whose sum is σ = 112387254. Its totient is φ = 32110640.

The previous prime is 64221281. The next prime is 64221299. The reversal of 64221284 is 48212246.

It can be written as a sum of positive squares in only one way, i.e., 44222500 + 19998784 = 6650^2 + 4472^2 .

It is not an unprimeable number, because it can be changed into a prime (64221281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8027657 + ... + 8027664.

It is an arithmetic number, because the mean of its divisors is an integer number (18731209).

Almost surely, 2^64221284 is an apocalyptic number.

It is an amenable number.

64221284 is a deficient number, since it is larger than the sum of its proper divisors (48165970).

64221284 is a wasteful number, since it uses less digits than its factorization.

64221284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16055325 (or 16055323 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

The square root of 64221284 is about 8013.8183158841. The cubic root of 64221284 is about 400.4604780299.

The spelling of 64221284 in words is "sixty-four million, two hundred twenty-one thousand, two hundred eighty-four".