68075281 has 4 divisors (see below), whose sum is σ = 68102464. Its totient is φ = 68048100.

The previous prime is 68075263. The next prime is 68075303. The reversal of 68075281 is 18257086.

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 a de Polignac number, because none of the positive numbers 2^k-68075281 is a prime.

It is a super-2 number, since 2×68075281² = 9268487766457922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68075281.

It is not an unprimeable number, because it can be changed into a prime (68075221) 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 in 3 ways as a sum of consecutive naturals, for example, 9405 + ... + 14986.

It is an arithmetic number, because the mean of its divisors is an integer number (17025616).

Almost surely, 2^68075281 is an apocalyptic number.

It is an amenable number.

68075281 is a deficient number, since it is larger than the sum of its proper divisors (27183).

68075281 is a wasteful number, since it uses less digits than its factorization.

68075281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27182.

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 68075281 is about 8250.7745696995. The cubic root of 68075281 is about 408.3160777196.

The spelling of 68075281 in words is "sixty-eight million, seventy-five thousand, two hundred eighty-one".