68789381 has 4 divisors (see below), whose sum is σ = 68963052. Its totient is φ = 68615712.

The previous prime is 68789359. The next prime is 68789387. The reversal of 68789381 is 18398786.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 56776225 + 12013156 = 7535^2 + 3466^2 .

It is a cyclic number.

It is not a de Polignac number, because 68789381 - 2²² = 64595077 is a prime.

It is a super-2 number, since 2×68789381² = 9463957876726322, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68789387) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86240 + ... + 87033.

It is an arithmetic number, because the mean of its divisors is an integer number (17240763).

Almost surely, 2^68789381 is an apocalyptic number.

It is an amenable number.

68789381 is a deficient number, since it is larger than the sum of its proper divisors (173671).

68789381 is a wasteful number, since it uses less digits than its factorization.

68789381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173670.

The product of its digits is 580608, while the sum is 50.

The square root of 68789381 is about 8293.9363995632. The cubic root of 68789381 is about 409.7388402268.

The spelling of 68789381 in words is "sixty-eight million, seven hundred eighty-nine thousand, three hundred eighty-one".