57678809 has 2 divisors, whose sum is σ = 57678810. Its totient is φ = 57678808.

The previous prime is 57678799. The next prime is 57678847. The reversal of 57678809 is 90887675.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55547209 + 2131600 = 7453^2 + 1460^2 .

It is a cyclic number.

It is not a de Polignac number, because 57678809 - 2⁸ = 57678553 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57678209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28839404 + 28839405.

It is an arithmetic number, because the mean of its divisors is an integer number (28839405).

Almost surely, 2^57678809 is an apocalyptic number.

It is an amenable number.

57678809 is a deficient number, since it is larger than the sum of its proper divisors (1).

57678809 is an equidigital number, since it uses as much as digits as its factorization.

57678809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 57678809 is about 7594.6566084320. The cubic root of 57678809 is about 386.3718061043.

The spelling of 57678809 in words is "fifty-seven million, six hundred seventy-eight thousand, eight hundred nine".