77808055 has 16 divisors (see below), whose sum is σ = 100989504. Its totient is φ = 57208320.

The previous prime is 77808053. The next prime is 77808061. The reversal of 77808055 is 55080877.

It is not a de Polignac number, because 77808055 - 2¹ = 77808053 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77807999 and 77808017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77808053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13182 + ... + 18148.

It is an arithmetic number, because the mean of its divisors is an integer number (6311844).

Almost surely, 2^77808055 is an apocalyptic number.

77808055 is a deficient number, since it is larger than the sum of its proper divisors (23181449).

77808055 is a wasteful number, since it uses less digits than its factorization.

77808055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5226.

The product of its (nonzero) digits is 78400, while the sum is 40.

The square root of 77808055 is about 8820.8874270110. The cubic root of 77808055 is about 426.9151035910.

The spelling of 77808055 in words is "seventy-seven million, eight hundred eight thousand, fifty-five".