85978757 has 2 divisors, whose sum is σ = 85978758. Its totient is φ = 85978756.

The previous prime is 85978733. The next prime is 85978759. The reversal of 85978757 is 75787958.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62948356 + 23030401 = 7934^2 + 4799^2 .

It is a cyclic number.

It is not a de Polignac number, because 85978757 - 2¹⁸ = 85716613 is a prime.

Together with 85978759, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85978759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42989378 + 42989379.

It is an arithmetic number, because the mean of its divisors is an integer number (42989379).

Almost surely, 2^85978757 is an apocalyptic number.

It is an amenable number.

85978757 is a deficient number, since it is larger than the sum of its proper divisors (1).

85978757 is an equidigital number, since it uses as much as digits as its factorization.

85978757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4939200, while the sum is 56.

The square root of 85978757 is about 9272.4730789580. The cubic root of 85978757 is about 441.3641495663.

The spelling of 85978757 in words is "eighty-five million, nine hundred seventy-eight thousand, seven hundred fifty-seven".