68680919 has 4 divisors (see below), whose sum is σ = 68706120. Its totient is φ = 68655720.

The previous prime is 68680907. The next prime is 68680939. The reversal of 68680919 is 91908686.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91908686 = 2 ⋅45954343.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68680919 is a prime.

It is a super-2 number, since 2×68680919² = 9434137269369122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68680939) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7937 + ... + 14154.

It is an arithmetic number, because the mean of its divisors is an integer number (17176530).

Almost surely, 2^68680919 is an apocalyptic number.

68680919 is a deficient number, since it is larger than the sum of its proper divisors (25201).

68680919 is a wasteful number, since it uses less digits than its factorization.

68680919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25200.

The product of its (nonzero) digits is 186624, while the sum is 47.

The square root of 68680919 is about 8287.3951878742. The cubic root of 68680919 is about 409.5233783291.

The spelling of 68680919 in words is "sixty-eight million, six hundred eighty thousand, nine hundred nineteen".