68904881 has 2 divisors, whose sum is σ = 68904882. Its totient is φ = 68904880.

The previous prime is 68904851. The next prime is 68904883. The reversal of 68904881 is 18840986.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61701025 + 7203856 = 7855^2 + 2684^2 .

It is a cyclic number.

It is not a de Polignac number, because 68904881 - 2¹⁴ = 68888497 is a prime.

It is a super-2 number, since 2×68904881² = 9495765251248322, which contains 22 as substring.

Together with 68904883, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (68904883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34452440 + 34452441.

It is an arithmetic number, because the mean of its divisors is an integer number (34452441).

Almost surely, 2^68904881 is an apocalyptic number.

It is an amenable number.

68904881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68904881 is an equidigital number, since it uses as much as digits as its factorization.

68904881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 110592, while the sum is 44.

The square root of 68904881 is about 8300.8963973778. The cubic root of 68904881 is about 409.9680343907.

The spelling of 68904881 in words is "sixty-eight million, nine hundred four thousand, eight hundred eighty-one".