57280220 has 48 divisors (see below), whose sum is σ = 126554400. Its totient is φ = 21745920.

The previous prime is 57280217. The next prime is 57280229. The reversal of 57280220 is 2208275.

57280220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 57280220.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57280229) 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 15 ways as a sum of consecutive naturals, for example, 34571 + ... + 36189.

It is an arithmetic number, because the mean of its divisors is an integer number (2636550).

Almost surely, 2^57280220 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 57280220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63277200).

57280220 is an abundant number, since it is smaller than the sum of its proper divisors (69274180).

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

57280220 is a wasteful number, since it uses less digits than its factorization.

57280220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718 (or 1716 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 26.

The square root of 57280220 is about 7568.3697055575. The cubic root of 57280220 is about 385.4797415283.

Adding to 57280220 its reverse (2208275), we get a palindrome (59488495).

The spelling of 57280220 in words is "fifty-seven million, two hundred eighty thousand, two hundred twenty".