55778443 has 4 divisors (see below), whose sum is σ = 63746800. Its totient is φ = 47810088.

The previous prime is 55778417. The next prime is 55778449. The reversal of 55778443 is 34487755.

55778443 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55778443 is a prime.

It is a super-2 number, since 2×55778443² = 6222469407008498, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55778443.

It is not an unprimeable number, because it can be changed into a prime (55778449) 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 3 ways as a sum of consecutive naturals, for example, 3984168 + ... + 3984181.

It is an arithmetic number, because the mean of its divisors is an integer number (15936700).

Almost surely, 2^55778443 is an apocalyptic number.

55778443 is a deficient number, since it is larger than the sum of its proper divisors (7968357).

55778443 is an equidigital number, since it uses as much as digits as its factorization.

55778443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7968356.

The product of its digits is 470400, while the sum is 43.

The square root of 55778443 is about 7468.4967028178. The cubic root of 55778443 is about 382.0810181492.

The spelling of 55778443 in words is "fifty-five million, seven hundred seventy-eight thousand, four hundred forty-three".