57678221 has 2 divisors, whose sum is σ = 57678222. Its totient is φ = 57678220.

The previous prime is 57678217. The next prime is 57678307. The reversal of 57678221 is 12287675.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57304900 + 373321 = 7570^2 + 611^2 .

It is a cyclic number.

It is not a de Polignac number, because 57678221 - 2² = 57678217 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (57678521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28839110 + 28839111.

It is an arithmetic number, because the mean of its divisors is an integer number (28839111).

Almost surely, 2^57678221 is an apocalyptic number.

It is an amenable number.

57678221 is a deficient number, since it is larger than the sum of its proper divisors (1).

57678221 is an equidigital number, since it uses as much as digits as its factorization.

57678221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 38.

The square root of 57678221 is about 7594.6178969057. The cubic root of 57678221 is about 386.3704931588.

The spelling of 57678221 in words is "fifty-seven million, six hundred seventy-eight thousand, two hundred twenty-one".