77804640877 has 16 divisors (see below), whose sum is σ = 84670202880. Its totient is φ = 71213246208.

The previous prime is 77804640871. The next prime is 77804640913.

It is a happy number.

77804640877 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 77804640877 - 2³ = 77804640869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77804640871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 184677 + ... + 435562.

It is an arithmetic number, because the mean of its divisors is an integer number (5291887680).

Almost surely, 2^77804640877 is an apocalyptic number.

It is an amenable number.

77804640877 is a deficient number, since it is larger than the sum of its proper divisors (6865562003).

77804640877 is a wasteful number, since it uses less digits than its factorization.

77804640877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620460.

The product of its (nonzero) digits is 14751744, while the sum is 58.

The spelling of 77804640877 in words is "seventy-seven billion, eight hundred four million, six hundred forty thousand, eight hundred seventy-seven".