55778 has 6 divisors (see below), whose sum is σ = 84171. Its totient is φ = 27722.

The previous prime is 55763. The next prime is 55787. The reversal of 55778 is 87755.

It can be written as a sum of positive squares in only one way, i.e., 27889 + 27889 = 167^2 + 167^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=167.

It is a super-2 number, since 2×55778² = 6222370568, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 10.

It is an unprimeable number.

55778 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 2 ways as a sum of consecutive naturals, for example, 251 + ... + 417.

2⁵⁵⁷⁷⁸ is an apocalyptic number.

55778 is a deficient number, since it is larger than the sum of its proper divisors (28393).

55778 is an equidigital number, since it uses as much as digits as its factorization.

55778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336 (or 169 counting only the distinct ones).

The product of its digits is 9800, while the sum is 32.

The square root of 55778 is about 236.1736649163. The cubic root of 55778 is about 38.2080006633.

Multiplying 55778 by its sum of digits (32), we get a square (1784896 = 1336²).

Multiplying 55778 by its product of digits (9800), we get a square (546624400 = 23380²).

The spelling of 55778 in words is "fifty-five thousand, seven hundred seventy-eight".