208693664 has 12 divisors (see below), whose sum is σ = 410865714. Its totient is φ = 104346816.

The previous prime is 208693631. The next prime is 208693669. The reversal of 208693664 is 466396802.

It can be written as a sum of positive squares in only one way, i.e., 146410000 + 62283664 = 12100^2 + 7892^2 .

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (208693669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3260807 + ... + 3260870.

Almost surely, 2^208693664 is an apocalyptic number.

It is an amenable number.

208693664 is a deficient number, since it is larger than the sum of its proper divisors (202172050).

208693664 is an equidigital number, since it uses as much as digits as its factorization.

208693664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6521687 (or 6521679 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 44.

The square root of 208693664 is about 14446.2335575748. The cubic root of 208693664 is about 593.1571292902.

The spelling of 208693664 in words is "two hundred eight million, six hundred ninety-three thousand, six hundred sixty-four".