68777881 has 2 divisors, whose sum is σ = 68777882. Its totient is φ = 68777880.

The previous prime is 68777837. The next prime is 68777909. The reversal of 68777881 is 18877786.

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., 53056656 + 15721225 = 7284^2 + 3965^2 .

It is a cyclic number.

It is not a de Polignac number, because 68777881 - 2¹⁹ = 68253593 is a prime.

It is a super-2 number, since 2×68777881² = 9460793829700322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (68777831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34388940 + 34388941.

It is an arithmetic number, because the mean of its divisors is an integer number (34388941).

Almost surely, 2^68777881 is an apocalyptic number.

It is an amenable number.

68777881 is a deficient number, since it is larger than the sum of its proper divisors (1).

68777881 is an equidigital number, since it uses as much as digits as its factorization.

68777881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1053696, while the sum is 52.

The square root of 68777881 is about 8293.2430930246. The cubic root of 68777881 is about 409.7160059889.

The spelling of 68777881 in words is "sixty-eight million, seven hundred seventy-seven thousand, eight hundred eighty-one".