77696209 has 8 divisors (see below), whose sum is σ = 78343848. Its totient is φ = 77051520.

The previous prime is 77696183. The next prime is 77696257. The reversal of 77696209 is 90269677.

It can be written as a sum of positive squares in 4 ways, for example, as 29463184 + 48233025 = 5428^2 + 6945^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77696209 - 2¹⁵ = 77663441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77696009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102259 + ... + 103015.

It is an arithmetic number, because the mean of its divisors is an integer number (9792981).

Almost surely, 2^77696209 is an apocalyptic number.

It is an amenable number.

77696209 is a deficient number, since it is larger than the sum of its proper divisors (647639).

77696209 is a wasteful number, since it uses less digits than its factorization.

77696209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1475.

The product of its (nonzero) digits is 285768, while the sum is 46.

The square root of 77696209 is about 8814.5453087496. The cubic root of 77696209 is about 426.7104476423.

The spelling of 77696209 in words is "seventy-seven million, six hundred ninety-six thousand, two hundred nine".