68665644 has 30 divisors (see below), whose sum is σ = 179506404. Its totient is φ = 22888440.

The previous prime is 68665643. The next prime is 68665679. The reversal of 68665644 is 44656686.

68665644 is a `hidden beast` number, since 6 + 86 + 6 + 564 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 68665644.

It is not an unprimeable number, because it can be changed into a prime (68665643) 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 in 9 ways as a sum of consecutive naturals, for example, 105642 + ... + 106289.

Almost surely, 2^68665644 is an apocalyptic number.

It is an amenable number.

68665644 is an abundant number, since it is smaller than the sum of its proper divisors (110840760).

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

68665644 is a wasteful number, since it uses less digits than its factorization.

68665644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211947 (or 211936 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 68665644 is about 8286.4735563447. The cubic root of 68665644 is about 409.4930160223.

The spelling of 68665644 in words is "sixty-eight million, six hundred sixty-five thousand, six hundred forty-four".