68440757 has 16 divisors (see below), whose sum is σ = 85708800. Its totient is φ = 53093040.

The previous prime is 68440747. The next prime is 68440763. The reversal of 68440757 is 75704486.

It is not a de Polignac number, because 68440757 - 2⁴ = 68440741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68440747) 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 15 ways as a sum of consecutive naturals, for example, 16544 + ... + 20262.

It is an arithmetic number, because the mean of its divisors is an integer number (5356800).

Almost surely, 2^68440757 is an apocalyptic number.

It is an amenable number.

68440757 is a deficient number, since it is larger than the sum of its proper divisors (17268043).

68440757 is a wasteful number, since it uses less digits than its factorization.

68440757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3976.

The product of its (nonzero) digits is 188160, while the sum is 41.

The square root of 68440757 is about 8272.8929039363. The cubic root of 68440757 is about 409.0454832718.

The spelling of 68440757 in words is "sixty-eight million, four hundred forty thousand, seven hundred fifty-seven".