85928809 has 4 divisors (see below), whose sum is σ = 87337540. Its totient is φ = 84520080.

The previous prime is 85928803. The next prime is 85928861. The reversal of 85928809 is 90882958.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90882958 = 2 ⋅45441479.

It can be written as a sum of positive squares in 2 ways, for example, as 24651225 + 61277584 = 4965^2 + 7828^2 .

It is a cyclic number.

It is not a de Polignac number, because 85928809 - 2¹⁷ = 85797737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (85928803) 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, 704274 + ... + 704395.

It is an arithmetic number, because the mean of its divisors is an integer number (21834385).

Almost surely, 2^85928809 is an apocalyptic number.

It is an amenable number.

85928809 is a deficient number, since it is larger than the sum of its proper divisors (1408731).

85928809 is a wasteful number, since it uses less digits than its factorization.

85928809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1408730.

The product of its (nonzero) digits is 414720, while the sum is 49.

The square root of 85928809 is about 9269.7793393370. The cubic root of 85928809 is about 441.2786651682.

The spelling of 85928809 in words is "eighty-five million, nine hundred twenty-eight thousand, eight hundred nine".