68257581 has 16 divisors (see below), whose sum is σ = 104129664. Its totient is φ = 38960064.

The previous prime is 68257577. The next prime is 68257591. The reversal of 68257581 is 18575286.

It is not a de Polignac number, because 68257581 - 2² = 68257577 is a prime.

It is a super-2 number, since 2×68257581² = 9318194727943122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68257591) 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, 29395 + ... + 31631.

It is an arithmetic number, because the mean of its divisors is an integer number (6508104).

Almost surely, 2^68257581 is an apocalyptic number.

It is an amenable number.

68257581 is a deficient number, since it is larger than the sum of its proper divisors (35872083).

68257581 is a wasteful number, since it uses less digits than its factorization.

68257581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3700.

The product of its digits is 134400, while the sum is 42.

The square root of 68257581 is about 8261.8146311812. The cubic root of 68257581 is about 408.6802318053.

The spelling of 68257581 in words is "sixty-eight million, two hundred fifty-seven thousand, five hundred eighty-one".