68440019 has 4 divisors (see below), whose sum is σ = 71415696. Its totient is φ = 65464344.

The previous prime is 68440007. The next prime is 68440027. The reversal of 68440019 is 91004486.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91004486 = 2 ⋅45502243.

It is a cyclic number.

It is not a de Polignac number, because 68440019 - 2⁴ = 68440003 is a prime.

It is a super-2 number, since 2×68440019² = 9368072401440722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68440049) 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 3 ways as a sum of consecutive naturals, for example, 1487804 + ... + 1487849.

It is an arithmetic number, because the mean of its divisors is an integer number (17853924).

Almost surely, 2^68440019 is an apocalyptic number.

68440019 is a deficient number, since it is larger than the sum of its proper divisors (2975677).

68440019 is a wasteful number, since it uses less digits than its factorization.

68440019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2975676.

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 68440019 is about 8272.8483003135. The cubic root of 68440019 is about 409.0440130141.

The spelling of 68440019 in words is "sixty-eight million, four hundred forty thousand, nineteen".