68118644 has 18 divisors (see below), whose sum is σ = 131030802. Its totient is φ = 30962800.

The previous prime is 68118637. The next prime is 68118647. The reversal of 68118644 is 44681186.

It can be written as a sum of positive squares in only one way, i.e., 57942544 + 10176100 = 7612^2 + 3190^2 .

It is a junction number, because it is equal to n+sod(n) for n = 68118598 and 68118607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68118647) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 69887 + ... + 70854.

It is an arithmetic number, because the mean of its divisors is an integer number (7279489).

Almost surely, 2^68118644 is an apocalyptic number.

It is an amenable number.

68118644 is a deficient number, since it is larger than the sum of its proper divisors (62912158).

68118644 is a wasteful number, since it uses less digits than its factorization.

68118644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140767 (or 140754 counting only the distinct ones).

The product of its digits is 36864, while the sum is 38.

The square root of 68118644 is about 8253.4019652505. The cubic root of 68118644 is about 408.4027565243.

The spelling of 68118644 in words is "sixty-eight million, one hundred eighteen thousand, six hundred forty-four".