778370055 has 32 divisors (see below), whose sum is σ = 1338854400. Its totient is φ = 384907392.

The previous prime is 778370051. The next prime is 778370069. The reversal of 778370055 is 550073877.

It is not a de Polignac number, because 778370055 - 2² = 778370051 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 778369989 and 778370016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (778370051) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15660 + ... + 42449.

It is an arithmetic number, because the mean of its divisors is an integer number (41839200).

Almost surely, 2^778370055 is an apocalyptic number.

778370055 is a deficient number, since it is larger than the sum of its proper divisors (560484345).

778370055 is a wasteful number, since it uses less digits than its factorization.

778370055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58183.

The product of its (nonzero) digits is 205800, while the sum is 42.

The square root of 778370055 is about 27899.2841306009. The cubic root of 778370055 is about 919.8747683195.

The spelling of 778370055 in words is "seven hundred seventy-eight million, three hundred seventy thousand, fifty-five".