57078389 has 4 divisors (see below), whose sum is σ = 57666924. Its totient is φ = 56489856.

The previous prime is 57078349. The next prime is 57078397. The reversal of 57078389 is 98387075.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 45292900 + 11785489 = 6730^2 + 3433^2 .

It is a cyclic number.

It is not a de Polignac number, because 57078389 - 2¹⁶ = 57012853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57078349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294122 + ... + 294315.

It is an arithmetic number, because the mean of its divisors is an integer number (14416731).

Almost surely, 2^57078389 is an apocalyptic number.

It is an amenable number.

57078389 is a deficient number, since it is larger than the sum of its proper divisors (588535).

57078389 is an equidigital number, since it uses as much as digits as its factorization.

57078389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588534.

The product of its (nonzero) digits is 423360, while the sum is 47.

The square root of 57078389 is about 7555.0240899682. The cubic root of 57078389 is about 385.0264534587.

The spelling of 57078389 in words is "fifty-seven million, seventy-eight thousand, three hundred eighty-nine".