64649668 has 6 divisors (see below), whose sum is σ = 113136926. Its totient is φ = 32324832.

The previous prime is 64649653. The next prime is 64649699. The reversal of 64649668 is 86694646.

It can be written as a sum of positive squares in only one way, i.e., 43138624 + 21511044 = 6568^2 + 4638^2 .

It is a zygodrome in base 3.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8081205 + ... + 8081212.

Almost surely, 2^64649668 is an apocalyptic number.

It is an amenable number.

64649668 is a deficient number, since it is larger than the sum of its proper divisors (48487258).

64649668 is a wasteful number, since it uses less digits than its factorization.

64649668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16162421 (or 16162419 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 49.

The square root of 64649668 is about 8040.5017256388. The cubic root of 64649668 is about 401.3489209174.

The spelling of 64649668 in words is "sixty-four million, six hundred forty-nine thousand, six hundred sixty-eight".