55778544 has 100 divisors (see below), whose sum is σ = 163003456. Its totient is φ = 18413568.

The previous prime is 55778543. The next prime is 55778549. The reversal of 55778544 is 44587755.

55778544 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×55778544² = 6222491941519872, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55778544.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55778543) 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 19 ways as a sum of consecutive naturals, for example, 250017 + ... + 250239.

Almost surely, 2^55778544 is an apocalyptic number.

55778544 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55778544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81501728).

55778544 is an abundant number, since it is smaller than the sum of its proper divisors (107224912).

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

55778544 is a wasteful number, since it uses less digits than its factorization.

55778544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 421 counting only the distinct ones).

The product of its digits is 784000, while the sum is 45.

The square root of 55778544 is about 7468.5034645503. The cubic root of 55778544 is about 382.0812487649.

The spelling of 55778544 in words is "fifty-five million, seven hundred seventy-eight thousand, five hundred forty-four".