78571057 has 2 divisors, whose sum is σ = 78571058. Its totient is φ = 78571056.

The previous prime is 78571039. The next prime is 78571123. The reversal of 78571057 is 75017587.

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., 78304801 + 266256 = 8849^2 + 516^2 .

It is an emirp because it is prime and its reverse (75017587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78571057 - 2¹⁵ = 78538289 is a prime.

It is not a weakly prime, because it can be changed into another prime (78571027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39285528 + 39285529.

It is an arithmetic number, because the mean of its divisors is an integer number (39285529).

Almost surely, 2^78571057 is an apocalyptic number.

It is an amenable number.

78571057 is a deficient number, since it is larger than the sum of its proper divisors (1).

78571057 is an equidigital number, since it uses as much as digits as its factorization.

78571057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 68600, while the sum is 40.

The square root of 78571057 is about 8864.0316447991. The cubic root of 78571057 is about 428.3060396678.

The spelling of 78571057 in words is "seventy-eight million, five hundred seventy-one thousand, fifty-seven".