85766139 has 24 divisors (see below), whose sum is σ = 132546960. Its totient is φ = 53250048.

The previous prime is 85766053. The next prime is 85766147. The reversal of 85766139 is 93166758.

It is a happy number.

It is not a de Polignac number, because 85766139 - 2⁹ = 85765627 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 85766094 and 85766103.

It is not an unprimeable number, because it can be changed into a prime (85766179) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11952 + ... + 17730.

It is an arithmetic number, because the mean of its divisors is an integer number (5522790).

Almost surely, 2^85766139 is an apocalyptic number.

85766139 is a deficient number, since it is larger than the sum of its proper divisors (46780821).

85766139 is a wasteful number, since it uses less digits than its factorization.

85766139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5899 (or 5896 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 85766139 is about 9261.0009718172. Note that the first 3 decimals coincide. The cubic root of 85766139 is about 441.0000308513. Note that the first 4 decimals are identical.

It can be divided in two parts, 85766 and 139, that added together give a triangular number (85905 = T₄₁₄).

The spelling of 85766139 in words is "eighty-five million, seven hundred sixty-six thousand, one hundred thirty-nine".