55220250 has 128 divisors (see below), whose sum is σ = 150418944. Its totient is φ = 13440000.

The previous prime is 55220237. The next prime is 55220273. The reversal of 55220250 is 5202255.

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 in 63 ways as a sum of consecutive naturals, for example, 777715 + ... + 777785.

It is an arithmetic number, because the mean of its divisors is an integer number (1175148).

Almost surely, 2^55220250 is an apocalyptic number.

55220250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 55220250, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75209472).

55220250 is an abundant number, since it is smaller than the sum of its proper divisors (95198694).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55220250 is a wasteful number, since it uses less digits than its factorization.

55220250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 159 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 55220250 is about 7431.0329026320. The cubic root of 55220250 is about 380.8022064948.

It can be divided in two parts, 552 and 20250, that added together give a palindrome (20802).

The spelling of 55220250 in words is "fifty-five million, two hundred twenty thousand, two hundred fifty".