55631228 has 12 divisors (see below), whose sum is σ = 97439832. Its totient is φ = 27791280.

The previous prime is 55631209. The next prime is 55631237. The reversal of 55631228 is 82213655.

It is a junction number, because it is equal to n+sod(n) for n = 55631194 and 55631203.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 338 + ... + 10553.

It is an arithmetic number, because the mean of its divisors is an integer number (8119986).

Almost surely, 2^55631228 is an apocalyptic number.

It is an amenable number.

55631228 is a deficient number, since it is larger than the sum of its proper divisors (41808604).

55631228 is a wasteful number, since it uses less digits than its factorization.

55631228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12172 (or 12170 counting only the distinct ones).

The product of its digits is 14400, while the sum is 32.

The square root of 55631228 is about 7458.6344594704. The cubic root of 55631228 is about 381.7445822338.

The spelling of 55631228 in words is "fifty-five million, six hundred thirty-one thousand, two hundred twenty-eight".