55978 has 8 divisors (see below), whose sum is σ = 90468. Its totient is φ = 25824.

The previous prime is 55967. The next prime is 55987. The reversal of 55978 is 87955.

It can be written as a sum of positive squares in 2 ways, for example, as 45369 + 10609 = 213^2 + 103^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a plaindrome in base 15.

It is a nialpdrome in base 16.

It is an unprimeable number.

55978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051 + ... + 1102.

2⁵⁵⁹⁷⁸ is an apocalyptic number.

55978 is a deficient number, since it is larger than the sum of its proper divisors (34490).

55978 is a wasteful number, since it uses less digits than its factorization.

55978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2168.

The product of its digits is 12600, while the sum is 34.

The square root of 55978 is about 236.5967032737. The cubic root of 55978 is about 38.2536129414.

It can be divided in two parts, 5 and 5978, that multiplied together give a triangular number (29890 = T₂₄₄).

The spelling of 55978 in words is "fifty-five thousand, nine hundred seventy-eight".