68607281 has 4 divisors (see below), whose sum is σ = 69901812. Its totient is φ = 67312752.

The previous prime is 68607269. The next prime is 68607293. The reversal of 68607281 is 18270686.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (68607269) and next prime (68607293).

It can be written as a sum of positive squares in 2 ways, for example, as 27133681 + 41473600 = 5209^2 + 6440^2 .

It is a cyclic number.

It is not a de Polignac number, because 68607281 - 2²⁶ = 1498417 is a prime.

It is a super-2 number, since 2×68607281² = 9413918012425922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68607221) 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, 647186 + ... + 647291.

It is an arithmetic number, because the mean of its divisors is an integer number (17475453).

Almost surely, 2^68607281 is an apocalyptic number.

It is an amenable number.

68607281 is a deficient number, since it is larger than the sum of its proper divisors (1294531).

68607281 is a wasteful number, since it uses less digits than its factorization.

68607281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1294530.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 68607281 is about 8282.9512252578. The cubic root of 68607281 is about 409.3769656763.

It can be divided in two parts, 6860 and 7281, that added together give a palindrome (14141).

The spelling of 68607281 in words is "sixty-eight million, six hundred seven thousand, two hundred eighty-one".