57218740 has 48 divisors (see below), whose sum is σ = 127008000. Its totient is φ = 21617792.

The previous prime is 57218717. The next prime is 57218741. The reversal of 57218740 is 4781275.

It is a happy number.

57218740 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 57218696 and 57218705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57218741) 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, 26211 + ... + 28309.

It is an arithmetic number, because the mean of its divisors is an integer number (2646000).

Almost surely, 2^57218740 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 57218740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63504000).

57218740 is an abundant number, since it is smaller than the sum of its proper divisors (69789260).

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

57218740 is a wasteful number, since it uses less digits than its factorization.

57218740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2184 (or 2182 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 57218740 is about 7564.3069742046. The cubic root of 57218740 is about 385.3417777976.

The spelling of 57218740 in words is "fifty-seven million, two hundred eighteen thousand, seven hundred forty".