85781077 has 4 divisors (see below), whose sum is σ = 86665516. Its totient is φ = 84896640.

The previous prime is 85781071. The next prime is 85781107. The reversal of 85781077 is 77018758.

It is a happy number.

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 56685841 + 29095236 = 7529^2 + 5394^2 .

It is a cyclic number.

It is not a de Polignac number, because 85781077 - 2⁷ = 85780949 is a prime.

It is a super-3 number, since 3×85781077³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85781071) 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, 442074 + ... + 442267.

It is an arithmetic number, because the mean of its divisors is an integer number (21666379).

Almost surely, 2^85781077 is an apocalyptic number.

It is an amenable number.

85781077 is a deficient number, since it is larger than the sum of its proper divisors (884439).

85781077 is an equidigital number, since it uses as much as digits as its factorization.

85781077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884438.

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

The square root of 85781077 is about 9261.8074369963. The cubic root of 85781077 is about 441.0256325481.

The spelling of 85781077 in words is "eighty-five million, seven hundred eighty-one thousand, seventy-seven".