68440538 has 8 divisors (see below), whose sum is σ = 108699732. Its totient is φ = 32207296.

The previous prime is 68440511. The next prime is 68440549. The reversal of 68440538 is 83504486.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 67289209 + 1151329 = 8203^2 + 1073^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon 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, 1006445 + ... + 1006512.

Almost surely, 2^68440538 is an apocalyptic number.

68440538 is a deficient number, since it is larger than the sum of its proper divisors (40259194).

68440538 is a wasteful number, since it uses less digits than its factorization.

68440538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2012976.

The product of its (nonzero) digits is 92160, while the sum is 38.

The square root of 68440538 is about 8272.8796679270. The cubic root of 68440538 is about 409.0450469769.

The spelling of 68440538 in words is "sixty-eight million, four hundred forty thousand, five hundred thirty-eight".