57289387 has 2 divisors, whose sum is σ = 57289388. Its totient is φ = 57289386.

The previous prime is 57289367. The next prime is 57289391. The reversal of 57289387 is 78398275.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 57289387 - 2¹⁹ = 56765099 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 57289387.

It is not a weakly prime, because it can be changed into another prime (57289307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28644693 + 28644694.

It is an arithmetic number, because the mean of its divisors is an integer number (28644694).

Almost surely, 2^57289387 is an apocalyptic number.

57289387 is a deficient number, since it is larger than the sum of its proper divisors (1).

57289387 is an equidigital number, since it uses as much as digits as its factorization.

57289387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 49.

The square root of 57289387 is about 7568.9752939219. The cubic root of 57289387 is about 385.5003042071.

It can be divided in two parts, 57 and 289387, that added together give a square (289444 = 538²).

The spelling of 57289387 in words is "fifty-seven million, two hundred eighty-nine thousand, three hundred eighty-seven".