77688433 has 2 divisors, whose sum is σ = 77688434. Its totient is φ = 77688432.

The previous prime is 77688431. The next prime is 77688469. The reversal of 77688433 is 33488677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75637809 + 2050624 = 8697^2 + 1432^2 .

It is a cyclic number.

It is not a de Polignac number, because 77688433 - 2¹ = 77688431 is a prime.

Together with 77688431, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (77688431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38844216 + 38844217.

It is an arithmetic number, because the mean of its divisors is an integer number (38844217).

Almost surely, 2^77688433 is an apocalyptic number.

It is an amenable number.

77688433 is a deficient number, since it is larger than the sum of its proper divisors (1).

77688433 is an equidigital number, since it uses as much as digits as its factorization.

77688433 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 677376, while the sum is 46.

The square root of 77688433 is about 8814.1042085966. The cubic root of 77688433 is about 426.6962118077.

The spelling of 77688433 in words is "seventy-seven million, six hundred eighty-eight thousand, four hundred thirty-three".