77422789 has 2 divisors, whose sum is σ = 77422790. Its totient is φ = 77422788.

The previous prime is 77422783. The next prime is 77422819. The reversal of 77422789 is 98722477.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 76860289 + 562500 = 8767^2 + 750^2 .

It is a cyclic number.

It is not a de Polignac number, because 77422789 - 2⁵ = 77422757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (77422783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38711394 + 38711395.

It is an arithmetic number, because the mean of its divisors is an integer number (38711395).

Almost surely, 2^77422789 is an apocalyptic number.

It is an amenable number.

77422789 is a deficient number, since it is larger than the sum of its proper divisors (1).

77422789 is an equidigital number, since it uses as much as digits as its factorization.

77422789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 395136, while the sum is 46.

The square root of 77422789 is about 8799.0220479324. The cubic root of 77422789 is about 426.2093150941.

The spelling of 77422789 in words is "seventy-seven million, four hundred twenty-two thousand, seven hundred eighty-nine".