68589781 has 8 divisors (see below), whose sum is σ = 78211224. Its totient is φ = 59589120.

The previous prime is 68589751. The next prime is 68589793. The reversal of 68589781 is 18798586.

It can be written as a sum of positive squares in 4 ways, for example, as 26780625 + 41809156 = 5175^2 + 6466^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68589781 - 2¹¹ = 68587733 is a prime.

It is a super-2 number, since 2×68589781² = 9409116115255922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68589751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 154960 + ... + 155401.

It is an arithmetic number, because the mean of its divisors is an integer number (9776403).

Almost surely, 2^68589781 is an apocalyptic number.

It is an amenable number.

68589781 is a deficient number, since it is larger than the sum of its proper divisors (9621443).

68589781 is a wasteful number, since it uses less digits than its factorization.

68589781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310391.

The product of its digits is 967680, while the sum is 52.

The square root of 68589781 is about 8281.8947711257. The cubic root of 68589781 is about 409.3421554443.

The spelling of 68589781 in words is "sixty-eight million, five hundred eighty-nine thousand, seven hundred eighty-one".