85780205620 has 12 divisors (see below), whose sum is σ = 180138431844. Its totient is φ = 34312082240.

The previous prime is 85780205587. The next prime is 85780205627. The reversal of 85780205620 is 2650208758.

It can be written as a sum of positive squares in 2 ways, for example, as 40331082276 + 45449123344 = 200826^2 + 213188^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85780205627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2144505121 + ... + 2144505160.

It is an arithmetic number, because the mean of its divisors is an integer number (15011535987).

Almost surely, 2^85780205620 is an apocalyptic number.

It is an amenable number.

85780205620 is an abundant number, since it is smaller than the sum of its proper divisors (94358226224).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85780205620 is a wasteful number, since it uses less digits than its factorization.

85780205620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4289010290 (or 4289010288 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 43.

The spelling of 85780205620 in words is "eighty-five billion, seven hundred eighty million, two hundred five thousand, six hundred twenty".