68587281 has 12 divisors (see below), whose sum is σ = 113223552. Its totient is φ = 39192696.

The previous prime is 68587273. The next prime is 68587289. The reversal of 68587281 is 18278586.

68587281 is a `hidden beast` number, since 68 + 587 + 2 + 8 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (68587273) and next prime (68587289).

It is not a de Polignac number, because 68587281 - 2³ = 68587273 is a prime.

It is a super-2 number, since 2×68587281² = 9408430229945922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (68587289) 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 11 ways as a sum of consecutive naturals, for example, 544281 + ... + 544406.

It is an arithmetic number, because the mean of its divisors is an integer number (9435296).

Almost surely, 2^68587281 is an apocalyptic number.

It is an amenable number.

68587281 is a deficient number, since it is larger than the sum of its proper divisors (44636271).

68587281 is a wasteful number, since it uses less digits than its factorization.

68587281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088700 (or 1088697 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 68587281 is about 8281.7438381056. The cubic root of 68587281 is about 409.3371820707.

The spelling of 68587281 in words is "sixty-eight million, five hundred eighty-seven thousand, two hundred eighty-one".