855137808 has 180 divisors, whose sum is σ = 2948098140. Its totient is φ = 229920768.

The previous prime is 855137753. The next prime is 855137849. The reversal of 855137808 is 808731558.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 605750544 + 249387264 = 24612^2 + 15792^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 116388 + ... + 123516.

It is an arithmetic number, because the mean of its divisors is an integer number (16378323).

Almost surely, 2^855137808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855137808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1474049070).

855137808 is an abundant number, since it is smaller than the sum of its proper divisors (2092960332).

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

855137808 is a wasteful number, since it uses less digits than its factorization.

855137808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7174 (or 7158 counting only the distinct ones).

The product of its (nonzero) digits is 268800, while the sum is 45.

The square root of 855137808 is about 29242.7394065604. The cubic root of 855137808 is about 949.1729858916.

The spelling of 855137808 in words is "eight hundred fifty-five million, one hundred thirty-seven thousand, eight hundred eight".