85709405 has 4 divisors (see below), whose sum is σ = 102851292. Its totient is φ = 68567520.

The previous prime is 85709387. The next prime is 85709411. The reversal of 85709405 is 50490758.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50490758 = 2 ⋅25245379.

It can be written as a sum of positive squares in 2 ways, for example, as 38663524 + 47045881 = 6218^2 + 6859^2 .

It is not a de Polignac number, because 85709405 - 2²⁶ = 18600541 is a prime.

It is a super-2 number, since 2×85709405² = 14692204210908050, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8570936 + ... + 8570945.

It is an arithmetic number, because the mean of its divisors is an integer number (25712823).

Almost surely, 2^85709405 is an apocalyptic number.

It is an amenable number.

85709405 is a deficient number, since it is larger than the sum of its proper divisors (17141887).

85709405 is a wasteful number, since it uses less digits than its factorization.

85709405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17141886.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 85709405 is about 9257.9374052755. The cubic root of 85709405 is about 440.9027694112.

The spelling of 85709405 in words is "eighty-five million, seven hundred nine thousand, four hundred five".