68287181 has 8 divisors (see below), whose sum is σ = 74068344. Its totient is φ = 62702080.

The previous prime is 68287169. The next prime is 68287187. The reversal of 68287181 is 18178286.

It can be written as a sum of positive squares in 4 ways, for example, as 24661156 + 43626025 = 4966^2 + 6605^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-68287181 is a prime.

It is a super-2 number, since 2×68287181² = 9326278177853522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68287187) 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, 48290 + ... + 49683.

It is an arithmetic number, because the mean of its divisors is an integer number (9258543).

Almost surely, 2^68287181 is an apocalyptic number.

It is an amenable number.

68287181 is a deficient number, since it is larger than the sum of its proper divisors (5781163).

68287181 is a wasteful number, since it uses less digits than its factorization.

68287181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98031.

The product of its digits is 43008, while the sum is 41.

The square root of 68287181 is about 8263.6058110246. The cubic root of 68287181 is about 408.7392981951.

The spelling of 68287181 in words is "sixty-eight million, two hundred eighty-seven thousand, one hundred eighty-one".