55087222 has 4 divisors (see below), whose sum is σ = 82630836. Its totient is φ = 27543610.

The previous prime is 55087189. The next prime is 55087261. The reversal of 55087222 is 22278055.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22278055 = 5 ⋅4455611.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13771804 + ... + 13771807.

It is an arithmetic number, because the mean of its divisors is an integer number (20657709).

Almost surely, 2^55087222 is an apocalyptic number.

55087222 is a deficient number, since it is larger than the sum of its proper divisors (27543614).

55087222 is a wasteful number, since it uses less digits than its factorization.

55087222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27543613.

The product of its (nonzero) digits is 11200, while the sum is 31.

The square root of 55087222 is about 7422.0766635760. The cubic root of 55087222 is about 380.4961708826.

The spelling of 55087222 in words is "fifty-five million, eighty-seven thousand, two hundred twenty-two".