55990 has 16 divisors (see below), whose sum is σ = 110160. Its totient is φ = 20320.

The previous prime is 55987. The next prime is 55997. The reversal of 55990 is 9955.

It is a plaindrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 145 + ... + 364.

It is an arithmetic number, because the mean of its divisors is an integer number (6885).

2⁵⁵⁹⁹⁰ is an apocalyptic number.

55990 is a deficient number, since it is larger than the sum of its proper divisors (54170).

55990 is a wasteful number, since it uses less digits than its factorization.

55990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527.

The product of its (nonzero) digits is 2025, while the sum is 28.

The square root of 55990 is about 236.6220615243. The cubic root of 55990 is about 38.2563462209.

It can be divided in two parts, 5 and 5990, that added together give a palindrome (5995).

The spelling of 55990 in words is "fifty-five thousand, nine hundred ninety".