57678209 has 2 divisors, whose sum is σ = 57678210. Its totient is φ = 57678208.

The previous prime is 57678169. The next prime is 57678217. The reversal of 57678209 is 90287675.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54538225 + 3139984 = 7385^2 + 1772^2 .

It is a cyclic number.

It is not a de Polignac number, because 57678209 - 2⁸ = 57677953 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57678209.

It is not a weakly prime, because it can be changed into another prime (57678409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28839104 + 28839105.

It is an arithmetic number, because the mean of its divisors is an integer number (28839105).

Almost surely, 2^57678209 is an apocalyptic number.

It is an amenable number.

57678209 is a deficient number, since it is larger than the sum of its proper divisors (1).

57678209 is an equidigital number, since it uses as much as digits as its factorization.

57678209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 57678209 is about 7594.6171068725. The cubic root of 57678209 is about 386.3704663639.

The spelling of 57678209 in words is "fifty-seven million, six hundred seventy-eight thousand, two hundred nine".