68006281 has 16 divisors (see below), whose sum is σ = 81264640. Its totient is φ = 55682640.

The previous prime is 68006269. The next prime is 68006293. The reversal of 68006281 is 18260086.

68006281 = 159² + 160² + ... + 592².

It is an interprime number because it is at equal distance from previous prime (68006269) and next prime (68006293).

It is a cyclic number.

It is not a de Polignac number, because 68006281 - 2⁷ = 68006153 is a prime.

It is a super-2 number, since 2×68006281² = 9249708510901922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (68006231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15160 + ... + 19126.

It is an arithmetic number, because the mean of its divisors is an integer number (5079040).

Almost surely, 2^68006281 is an apocalyptic number.

It is an amenable number.

68006281 is a deficient number, since it is larger than the sum of its proper divisors (13258359).

68006281 is a wasteful number, since it uses less digits than its factorization.

68006281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4084.

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 68006281 is about 8246.5920840066. The cubic root of 68006281 is about 408.1780769008.

The spelling of 68006281 in words is "sixty-eight million, six thousand, two hundred eighty-one".