64205668 has 36 divisors (see below), whose sum is σ = 121485420. Its totient is φ = 29584896.

The previous prime is 64205641. The next prime is 64205683. The reversal of 64205668 is 86650246.

It can be written as a sum of positive squares in 2 ways, for example, as 30935844 + 33269824 = 5562^2 + 5768^2 .

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 623305 + ... + 623407.

It is an arithmetic number, because the mean of its divisors is an integer number (3374595).

Almost surely, 2^64205668 is an apocalyptic number.

64205668 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

64205668 is a deficient number, since it is larger than the sum of its proper divisors (57279752).

64205668 is a wasteful number, since it uses less digits than its factorization.

64205668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 64205668 is about 8012.8439395760. The cubic root of 64205668 is about 400.4280168406.

The spelling of 64205668 in words is "sixty-four million, two hundred five thousand, six hundred sixty-eight".