68666740 has 24 divisors (see below), whose sum is σ = 152683272. Its totient is φ = 25850880.

The previous prime is 68666711. The next prime is 68666749. The reversal of 68666740 is 4766686.

It can be written as a sum of positive squares in 4 ways, for example, as 3283344 + 65383396 = 1812^2 + 8086^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68666749) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 100641 + ... + 101320.

It is an arithmetic number, because the mean of its divisors is an integer number (6361803).

Almost surely, 2^68666740 is an apocalyptic number.

It is an amenable number.

68666740 is an abundant number, since it is smaller than the sum of its proper divisors (84016532).

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

68666740 is a wasteful number, since it uses less digits than its factorization.

68666740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201987 (or 201985 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 68666740 is about 8286.5396879518. The cubic root of 68666740 is about 409.4951947050.

The spelling of 68666740 in words is "sixty-eight million, six hundred sixty-six thousand, seven hundred forty".