68188081 has 8 divisors (see below), whose sum is σ = 73846080. Its totient is φ = 62589072.

The previous prime is 68188061. The next prime is 68188091. The reversal of 68188081 is 18088186.

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

It is not a de Polignac number, because 68188081 - 2⁵ = 68188049 is a prime.

It is a super-2 number, since 2×68188081² = 9299228780925122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68188061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12325 + ... + 16978.

It is an arithmetic number, because the mean of its divisors is an integer number (9230760).

Almost surely, 2^68188081 is an apocalyptic number.

It is an amenable number.

68188081 is a deficient number, since it is larger than the sum of its proper divisors (5657999).

68188081 is a wasteful number, since it uses less digits than its factorization.

68188081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29495.

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 68188081 is about 8257.6074622133. The cubic root of 68188081 is about 408.5414783695.

The spelling of 68188081 in words is "sixty-eight million, one hundred eighty-eight thousand, eighty-one".