57427209 has 24 divisors (see below), whose sum is σ = 95164992. Its totient is φ = 32689440.

The previous prime is 57427199. The next prime is 57427243. The reversal of 57427209 is 90272475.

57427209 = 302² + 303² + ... + 584².

It is not a de Polignac number, because 57427209 - 2⁴ = 57427193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57427259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16219 + ... + 19439.

It is an arithmetic number, because the mean of its divisors is an integer number (3965208).

Almost surely, 2^57427209 is an apocalyptic number.

It is an amenable number.

57427209 is a deficient number, since it is larger than the sum of its proper divisors (37737783).

57427209 is a wasteful number, since it uses less digits than its factorization.

57427209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3517 (or 3514 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 57427209 is about 7578.0742276650. The cubic root of 57427209 is about 385.8091914024.

The spelling of 57427209 in words is "fifty-seven million, four hundred twenty-seven thousand, two hundred nine".