57550220 has 96 divisors (see below), whose sum is σ = 150678528. Its totient is φ = 17978112.

The previous prime is 57550189. The next prime is 57550223. The reversal of 57550220 is 2205575.

57550220 = T₃₀₉ + T₃₁₀ + ... + T₇₂₀.

57550220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a self number, because there is not a number n which added to its sum of digits gives 57550220.

It is not an unprimeable number, because it can be changed into a prime (57550223) 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 31 ways as a sum of consecutive naturals, for example, 187307 + ... + 187613.

It is an arithmetic number, because the mean of its divisors is an integer number (1569568).

Almost surely, 2^57550220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57550220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75339264).

57550220 is an abundant number, since it is smaller than the sum of its proper divisors (93128308).

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

57550220 is a wasteful number, since it uses less digits than its factorization.

57550220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439 (or 437 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 26.

The square root of 57550220 is about 7586.1861300656. The cubic root of 57550220 is about 386.0844670046.

Adding to 57550220 its reverse (2205575), we get a palindrome (59755795).

The spelling of 57550220 in words is "fifty-seven million, five hundred fifty thousand, two hundred twenty".