57205509 has 16 divisors (see below), whose sum is σ = 79693824. Its totient is φ = 36457200.

The previous prime is 57205483. The next prime is 57205513. The reversal of 57205509 is 90550275.

It is not a de Polignac number, because 57205509 - 2¹⁵ = 57172741 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57205509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57205529) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4014 + ... + 11424.

It is an arithmetic number, because the mean of its divisors is an integer number (4980864).

Almost surely, 2^57205509 is an apocalyptic number.

It is an amenable number.

57205509 is a deficient number, since it is larger than the sum of its proper divisors (22488315).

57205509 is a wasteful number, since it uses less digits than its factorization.

57205509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7528.

The product of its (nonzero) digits is 15750, while the sum is 33.

The square root of 57205509 is about 7563.4323557496. The cubic root of 57205509 is about 385.3120739506.

The spelling of 57205509 in words is "fifty-seven million, two hundred five thousand, five hundred nine".