67788881 has 2 divisors, whose sum is σ = 67788882. Its totient is φ = 67788880.

The previous prime is 67788871. The next prime is 67788907. The reversal of 67788881 is 18888776.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 67502656 + 286225 = 8216^2 + 535^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67788881 is a prime.

It is a super-2 number, since 2×67788881² = 9190664774464322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (67788811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33894440 + 33894441.

It is an arithmetic number, because the mean of its divisors is an integer number (33894441).

Almost surely, 2^67788881 is an apocalyptic number.

It is an amenable number.

67788881 is a deficient number, since it is larger than the sum of its proper divisors (1).

67788881 is an equidigital number, since it uses as much as digits as its factorization.

67788881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1204224, while the sum is 53.

The square root of 67788881 is about 8233.4003303617. The cubic root of 67788881 is about 407.7426630000.

The spelling of 67788881 in words is "sixty-seven million, seven hundred eighty-eight thousand, eight hundred eighty-one".