68607881 has 4 divisors (see below), whose sum is σ = 70973700. Its totient is φ = 66242064.

The previous prime is 68607863. The next prime is 68607887. The reversal of 68607881 is 18870686.

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 20430400 + 48177481 = 4520^2 + 6941^2 .

It is a cyclic number.

It is not a de Polignac number, because 68607881 - 2²² = 64413577 is a prime.

It is a super-2 number, since 2×68607881² = 9414082670620322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (68607887) 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, 1182866 + ... + 1182923.

It is an arithmetic number, because the mean of its divisors is an integer number (17743425).

Almost surely, 2^68607881 is an apocalyptic number.

It is an amenable number.

68607881 is a deficient number, since it is larger than the sum of its proper divisors (2365819).

68607881 is a wasteful number, since it uses less digits than its factorization.

68607881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365818.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 68607881 is about 8282.9874441532. The cubic root of 68607881 is about 409.3781590650.

It can be divided in two parts, 6860 and 7881, that added together give a palindrome (14741).

The spelling of 68607881 in words is "sixty-eight million, six hundred seven thousand, eight hundred eighty-one".