55378 has 4 divisors (see below), whose sum is σ = 83070. Its totient is φ = 27688.

The previous prime is 55373. The next prime is 55381. The reversal of 55378 is 87355.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87355 = 5 ⋅17471.

It can be written as a sum of positive squares in only one way, i.e., 54289 + 1089 = 233^2 + 33^2 .

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (55373) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13843 + ... + 13846.

2⁵⁵³⁷⁸ is an apocalyptic number.

55378 is a deficient number, since it is larger than the sum of its proper divisors (27692).

55378 is a wasteful number, since it uses less digits than its factorization.

55378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27691.

The product of its digits is 4200, while the sum is 28.

The square root of 55378 is about 235.3253067564. The cubic root of 55378 is about 38.1164479609.

It can be divided in two parts, 553 and 78, that multiplied together give a palindrome (43134).

The spelling of 55378 in words is "fifty-five thousand, three hundred seventy-eight".