68308918 has 4 divisors (see below), whose sum is σ = 102463380. Its totient is φ = 34154458.

The previous prime is 68308913. The next prime is 68308931. The reversal of 68308918 is 81980386.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81980386 = 2 ⋅40990193.

It is a super-2 number, since 2×68308918² = 9332216556661448, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68308913) 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 as a sum of consecutive naturals, namely, 17077228 + ... + 17077231.

It is an arithmetic number, because the mean of its divisors is an integer number (25615845).

Almost surely, 2^68308918 is an apocalyptic number.

68308918 is a deficient number, since it is larger than the sum of its proper divisors (34154462).

68308918 is a wasteful number, since it uses less digits than its factorization.

68308918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34154461.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 68308918 is about 8264.9209312612. The cubic root of 68308918 is about 408.7826632086.

The spelling of 68308918 in words is "sixty-eight million, three hundred eight thousand, nine hundred eighteen".