64221616 has 10 divisors (see below), whose sum is σ = 124429412. Its totient is φ = 32110800.

The previous prime is 64221611. The next prime is 64221617. The reversal of 64221616 is 61612246.

It is not an unprimeable number, because it can be changed into a prime (64221611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2006910 + ... + 2006941.

Almost surely, 2^64221616 is an apocalyptic number.

It is an amenable number.

64221616 is a deficient number, since it is larger than the sum of its proper divisors (60207796).

64221616 is a wasteful number, since it uses less digits than its factorization.

64221616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4013859 (or 4013853 counting only the distinct ones).

The product of its digits is 3456, while the sum is 28.

The square root of 64221616 is about 8013.8390300779. The cubic root of 64221616 is about 400.4611681056.

The spelling of 64221616 in words is "sixty-four million, two hundred twenty-one thousand, six hundred sixteen".