77920055 has 8 divisors (see below), whose sum is σ = 93645072. Its totient is φ = 62242048.

The previous prime is 77920043. The next prime is 77920057. The reversal of 77920055 is 55002977.

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 77920055 - 2¹⁶ = 77854519 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 77919997 and 77920024.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77920057) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7994 + ... + 14823.

It is an arithmetic number, because the mean of its divisors is an integer number (11705634).

Almost surely, 2^77920055 is an apocalyptic number.

77920055 is a deficient number, since it is larger than the sum of its proper divisors (15725017).

77920055 is a wasteful number, since it uses less digits than its factorization.

77920055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23505.

The product of its (nonzero) digits is 22050, while the sum is 35.

The square root of 77920055 is about 8827.2337116449. The cubic root of 77920055 is about 427.1198448949.

The spelling of 77920055 in words is "seventy-seven million, nine hundred twenty thousand, fifty-five".