68740816 has 20 divisors (see below), whose sum is σ = 133615332. Its totient is φ = 34259456.

The previous prime is 68740801. The next prime is 68740829. The reversal of 68740816 is 61804786.

It can be written as a sum of positive squares in 2 ways, for example, as 25969216 + 42771600 = 5096^2 + 6540^2 .

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1705 + ... + 11848.

Almost surely, 2^68740816 is an apocalyptic number.

It is an amenable number.

68740816 is a deficient number, since it is larger than the sum of its proper divisors (64874516).

68740816 is a wasteful number, since it uses less digits than its factorization.

68740816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13878 (or 13872 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 68740816 is about 8291.0081413541. The cubic root of 68740816 is about 409.6423929206.

The spelling of 68740816 in words is "sixty-eight million, seven hundred forty thousand, eight hundred sixteen".