55220890 has 16 divisors (see below), whose sum is σ = 100067400. Its totient is φ = 21939520.

The previous prime is 55220887. The next prime is 55220899. The reversal of 55220890 is 9802255.

It is a happy number.

55220890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 44742721 + 10478169 = 6689^2 + 3237^2 .

It is not an unprimeable number, because it can be changed into a prime (55220899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17041 + ... + 20020.

Almost surely, 2^55220890 is an apocalyptic number.

55220890 is a deficient number, since it is larger than the sum of its proper divisors (44846510).

55220890 is a wasteful number, since it uses less digits than its factorization.

55220890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37217.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 55220890 is about 7431.0759651614. The cubic root of 55220890 is about 380.8036776488.

The spelling of 55220890 in words is "fifty-five million, two hundred twenty thousand, eight hundred ninety".