77609689 has 2 divisors, whose sum is σ = 77609690. Its totient is φ = 77609688.

The previous prime is 77609681. The next prime is 77609717. The reversal of 77609689 is 98690677.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52809289 + 24800400 = 7267^2 + 4980^2 .

It is a cyclic number.

It is not a de Polignac number, because 77609689 - 2³ = 77609681 is a prime.

It is not a weakly prime, because it can be changed into another prime (77609681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38804844 + 38804845.

It is an arithmetic number, because the mean of its divisors is an integer number (38804845).

Almost surely, 2^77609689 is an apocalyptic number.

It is an amenable number.

77609689 is a deficient number, since it is larger than the sum of its proper divisors (1).

77609689 is an equidigital number, since it uses as much as digits as its factorization.

77609689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The square root of 77609689 is about 8809.6361445862. The cubic root of 77609689 is about 426.5519984686.

The spelling of 77609689 in words is "seventy-seven million, six hundred nine thousand, six hundred eighty-nine".