108666640 has 20 divisors (see below), whose sum is σ = 252650124. Its totient is φ = 43466624.

The previous prime is 108666637. The next prime is 108666653. The reversal of 108666640 is 46666801.

It can be written as a sum of positive squares in 2 ways, for example, as 46949904 + 61716736 = 6852^2 + 7856^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 108666640.

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 3 ways as a sum of consecutive naturals, for example, 679087 + ... + 679246.

Almost surely, 2^108666640 is an apocalyptic number.

108666640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

108666640 is an abundant number, since it is smaller than the sum of its proper divisors (143983484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

108666640 is a wasteful number, since it uses less digits than its factorization.

108666640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1358346 (or 1358340 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 108666640 is about 10424.3292350156. The cubic root of 108666640 is about 477.1981444262.

The spelling of 108666640 in words is "one hundred eight million, six hundred sixty-six thousand, six hundred forty".