68090881 has 4 divisors (see below), whose sum is σ = 68117572. Its totient is φ = 68064192.

The previous prime is 68090863. The next prime is 68090903. The reversal of 68090881 is 18809086.

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 53582400 + 14508481 = 7320^2 + 3809^2 .

It is a cyclic number.

It is not a de Polignac number, because 68090881 - 2⁹ = 68090369 is a prime.

It is a super-2 number, since 2×68090881² = 9272736150712322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68090081) 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 3 ways as a sum of consecutive naturals, for example, 9060 + ... + 14773.

It is an arithmetic number, because the mean of its divisors is an integer number (17029393).

Almost surely, 2^68090881 is an apocalyptic number.

It is an amenable number.

68090881 is a deficient number, since it is larger than the sum of its proper divisors (26691).

68090881 is a wasteful number, since it uses less digits than its factorization.

68090881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26690.

The product of its (nonzero) digits is 27648, while the sum is 40.

The square root of 68090881 is about 8251.7198813338. The cubic root of 68090881 is about 408.3472649789.

The spelling of 68090881 in words is "sixty-eight million, ninety thousand, eight hundred eighty-one".