68348981 has 4 divisors (see below), whose sum is σ = 68635200. Its totient is φ = 68062764.

The previous prime is 68348977. The next prime is 68348999. The reversal of 68348981 is 18984386.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 68348981 - 2² = 68348977 is a prime.

It is a super-2 number, since 2×68348981² = 9343166407476722, 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 (68348081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142751 + ... + 143228.

It is an arithmetic number, because the mean of its divisors is an integer number (17158800).

Almost surely, 2^68348981 is an apocalyptic number.

It is an amenable number.

68348981 is a deficient number, since it is larger than the sum of its proper divisors (286219).

68348981 is a wasteful number, since it uses less digits than its factorization.

68348981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286218.

The product of its digits is 331776, while the sum is 47.

The square root of 68348981 is about 8267.3442531444. The cubic root of 68348981 is about 408.8625642408.

The spelling of 68348981 in words is "sixty-eight million, three hundred forty-eight thousand, nine hundred eighty-one".