85178077 has 2 divisors, whose sum is σ = 85178078. Its totient is φ = 85178076.

The previous prime is 85178069. The next prime is 85178089. The reversal of 85178077 is 77087158.

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., 79316836 + 5861241 = 8906^2 + 2421^2 .

It is a cyclic number.

It is not a de Polignac number, because 85178077 - 2³ = 85178069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (85178677) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42589038 + 42589039.

It is an arithmetic number, because the mean of its divisors is an integer number (42589039).

Almost surely, 2^85178077 is an apocalyptic number.

It is an amenable number.

85178077 is a deficient number, since it is larger than the sum of its proper divisors (1).

85178077 is an equidigital number, since it uses as much as digits as its factorization.

85178077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 109760, while the sum is 43.

The square root of 85178077 is about 9229.1969856537. The cubic root of 85178077 is about 439.9898017609.

The spelling of 85178077 in words is "eighty-five million, one hundred seventy-eight thousand, seventy-seven".