77828648909 has 16 divisors (see below), whose sum is σ = 86113463040. Its totient is φ = 69748224000.

The previous prime is 77828648903. The next prime is 77828648921. The reversal of 77828648909 is 90984682877.

It is a cyclic number.

It is not a de Polignac number, because 77828648909 - 2⁴ = 77828648893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77828648903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 487169 + ... + 626889.

It is an arithmetic number, because the mean of its divisors is an integer number (5382091440).

Almost surely, 2^77828648909 is an apocalyptic number.

77828648909 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

77828648909 is a deficient number, since it is larger than the sum of its proper divisors (8284814131).

77828648909 is a wasteful number, since it uses less digits than its factorization.

77828648909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140452.

The product of its (nonzero) digits is 97542144, while the sum is 68.

The spelling of 77828648909 in words is "seventy-seven billion, eight hundred twenty-eight million, six hundred forty-eight thousand, nine hundred nine".