57440557 has 2 divisors, whose sum is σ = 57440558. Its totient is φ = 57440556.

The previous prime is 57440527. The next prime is 57440573. The reversal of 57440557 is 75504475.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31573161 + 25867396 = 5619^2 + 5086^2 .

It is a cyclic number.

It is not a de Polignac number, because 57440557 - 2¹¹ = 57438509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57440527) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28720278 + 28720279.

It is an arithmetic number, because the mean of its divisors is an integer number (28720279).

Almost surely, 2^57440557 is an apocalyptic number.

It is an amenable number.

57440557 is a deficient number, since it is larger than the sum of its proper divisors (1).

57440557 is an equidigital number, since it uses as much as digits as its factorization.

57440557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 98000, while the sum is 37.

The square root of 57440557 is about 7578.9548751790. The cubic root of 57440557 is about 385.8390807309.

The spelling of 57440557 in words is "fifty-seven million, four hundred forty thousand, five hundred fifty-seven".