52657209 has 40 divisors (see below), whose sum is σ = 86736672. Its totient is φ = 31570560.

The previous prime is 52657207. The next prime is 52657217. The reversal of 52657209 is 90275625.

It is not a de Polignac number, because 52657209 - 2¹ = 52657207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (52657207) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 100422 + ... + 100944.

Almost surely, 2^52657209 is an apocalyptic number.

It is an amenable number.

52657209 is a deficient number, since it is larger than the sum of its proper divisors (34079463).

52657209 is a wasteful number, since it uses less digits than its factorization.

52657209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 659 (or 650 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 52657209 is about 7256.5287155774. The cubic root of 52657209 is about 374.8169987093.

The spelling of 52657209 in words is "fifty-two million, six hundred fifty-seven thousand, two hundred nine".