77689323209 has 4 divisors (see below), whose sum is σ = 77715760080. Its totient is φ = 77662886340.

The previous prime is 77689323167. The next prime is 77689323277. The reversal of 77689323209 is 90232398677.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90232398677 = 7901 ⋅11420377.

It is a cyclic number.

It is not a de Polignac number, because 77689323209 - 2¹⁶ = 77689257673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77689323109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13214027 + ... + 13219904.

It is an arithmetic number, because the mean of its divisors is an integer number (19428940020).

Almost surely, 2^77689323209 is an apocalyptic number.

It is an amenable number.

77689323209 is a deficient number, since it is larger than the sum of its proper divisors (26436871).

77689323209 is a wasteful number, since it uses less digits than its factorization.

77689323209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26436870.

The product of its (nonzero) digits is 6858432, while the sum is 56.

The spelling of 77689323209 in words is "seventy-seven billion, six hundred eighty-nine million, three hundred twenty-three thousand, two hundred nine".