64251668 has 24 divisors (see below), whose sum is σ = 121325568. Its totient is φ = 29596896.

The previous prime is 64251643. The next prime is 64251683. The reversal of 64251668 is 86615246.

64251668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37805 + ... + 39467.

It is an arithmetic number, because the mean of its divisors is an integer number (5055232).

Almost surely, 2^64251668 is an apocalyptic number.

It is an amenable number.

64251668 is a deficient number, since it is larger than the sum of its proper divisors (57073900).

64251668 is a wasteful number, since it uses less digits than its factorization.

64251668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2423 (or 2421 counting only the distinct ones).

The product of its digits is 69120, while the sum is 38.

The square root of 64251668 is about 8015.7138172467. The cubic root of 64251668 is about 400.5236225827.

The spelling of 64251668 in words is "sixty-four million, two hundred fifty-one thousand, six hundred sixty-eight".