85220789 has 4 divisors (see below), whose sum is σ = 85334124. Its totient is φ = 85107456.

The previous prime is 85220783. The next prime is 85220791. The reversal of 85220789 is 98702258.

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: 98702258 = 2 ⋅49351129.

It can be written as a sum of positive squares in 2 ways, for example, as 54140164 + 31080625 = 7358^2 + 5575^2 .

It is a cyclic number.

It is not a de Polignac number, because 85220789 - 2⁸ = 85220533 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85220783) 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, 55532 + ... + 57045.

It is an arithmetic number, because the mean of its divisors is an integer number (21333531).

Almost surely, 2^85220789 is an apocalyptic number.

It is an amenable number.

85220789 is a deficient number, since it is larger than the sum of its proper divisors (113335).

85220789 is a wasteful number, since it uses less digits than its factorization.

85220789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113334.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 85220789 is about 9231.5106564419. The cubic root of 85220789 is about 440.0633328257.

The spelling of 85220789 in words is "eighty-five million, two hundred twenty thousand, seven hundred eighty-nine".