77689429 has 2 divisors, whose sum is σ = 77689430. Its totient is φ = 77689428.

The previous prime is 77689399. The next prime is 77689453. The reversal of 77689429 is 92498677.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76475025 + 1214404 = 8745^2 + 1102^2 .

It is an emirp because it is prime and its reverse (92498677) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 77689429 - 2⁵ = 77689397 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77683429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38844714 + 38844715.

It is an arithmetic number, because the mean of its divisors is an integer number (38844715).

Almost surely, 2^77689429 is an apocalyptic number.

It is an amenable number.

77689429 is a deficient number, since it is larger than the sum of its proper divisors (1).

77689429 is an equidigital number, since it uses as much as digits as its factorization.

77689429 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1524096, while the sum is 52.

The square root of 77689429 is about 8814.1607087686. The cubic root of 77689429 is about 426.6980352778.

The spelling of 77689429 in words is "seventy-seven million, six hundred eighty-nine thousand, four hundred twenty-nine".