68395581 has 6 divisors (see below), whose sum is σ = 98793630. Its totient is φ = 45597048.

The previous prime is 68395571. The next prime is 68395589. The reversal of 68395581 is 18559386.

68395581 is a `hidden beast` number, since 68 + 3 + 9 + 5 + 581 = 666.

It can be written as a sum of positive squares in only one way, i.e., 63059481 + 5336100 = 7941^2 + 2310^2 .

It is not a de Polignac number, because 68395581 - 2¹⁴ = 68379197 is a prime.

It is a super-2 number, since 2×68395581² = 9355911000655122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68395589) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3799746 + ... + 3799763.

It is an arithmetic number, because the mean of its divisors is an integer number (16465605).

Almost surely, 2^68395581 is an apocalyptic number.

It is an amenable number.

68395581 is a deficient number, since it is larger than the sum of its proper divisors (30398049).

68395581 is a wasteful number, since it uses less digits than its factorization.

68395581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7599515 (or 7599512 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 68395581 is about 8270.1620903100. The cubic root of 68395581 is about 408.9554632949.

The spelling of 68395581 in words is "sixty-eight million, three hundred ninety-five thousand, five hundred eighty-one".