85378057 has 2 divisors, whose sum is σ = 85378058. Its totient is φ = 85378056.

The previous prime is 85378049. The next prime is 85378079. The reversal of 85378057 is 75087358.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81649296 + 3728761 = 9036^2 + 1931^2 .

It is a cyclic number.

It is not a de Polignac number, because 85378057 - 2³ = 85378049 is a prime.

It is not a weakly prime, because it can be changed into another prime (85378087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42689028 + 42689029.

It is an arithmetic number, because the mean of its divisors is an integer number (42689029).

Almost surely, 2^85378057 is an apocalyptic number.

It is an amenable number.

85378057 is a deficient number, since it is larger than the sum of its proper divisors (1).

85378057 is an equidigital number, since it uses as much as digits as its factorization.

85378057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 235200, while the sum is 43.

The square root of 85378057 is about 9240.0247294041. The cubic root of 85378057 is about 440.3338667808. Note that the first 3 decimals are identical.

The spelling of 85378057 in words is "eighty-five million, three hundred seventy-eight thousand, fifty-seven".