13055778 has 12 divisors (see below), whose sum is σ = 28287558. Its totient is φ = 4351920.

The previous prime is 13055773. The next prime is 13055803. The reversal of 13055778 is 87755031.

13055778 is a `hidden beast` number, since 1 + 30 + 557 + 78 = 666.

13055778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 10323369 + 2732409 = 3213^2 + 1653^2 .

It is not an unprimeable number, because it can be changed into a prime (13055773) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 362643 + ... + 362678.

Almost surely, 2^13055778 is an apocalyptic number.

13055778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

13055778 is an abundant number, since it is smaller than the sum of its proper divisors (15231780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13055778 is a wasteful number, since it uses less digits than its factorization.

13055778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725329 (or 725326 counting only the distinct ones).

The product of its (nonzero) digits is 29400, while the sum is 36.

The square root of 13055778 is about 3613.2780131067. The cubic root of 13055778 is about 235.4692780457.

The spelling of 13055778 in words is "thirteen million, fifty-five thousand, seven hundred seventy-eight".