57143520 has 144 divisors (see below), whose sum is σ = 222899040. Its totient is φ = 13059072.

The previous prime is 57143491. The next prime is 57143531. The reversal of 57143520 is 2534175.

It is a happy number.

57143520 is a `hidden beast` number, since 571 + 43 + 52 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7246 + ... + 12914.

It is an arithmetic number, because the mean of its divisors is an integer number (1547910).

Almost surely, 2^57143520 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 57143520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111449520).

57143520 is an abundant number, since it is smaller than the sum of its proper divisors (165755520).

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

57143520 is a wasteful number, since it uses less digits than its factorization.

57143520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5697 (or 5686 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 57143520 is about 7559.3333039363. Note that the first 4 decimals coincide. The cubic root of 57143520 is about 385.1728464343.

Adding to 57143520 its reverse (2534175), we get a palindrome (59677695).

The spelling of 57143520 in words is "fifty-seven million, one hundred forty-three thousand, five hundred twenty".