855805500 has 480 divisors, whose sum is σ = 3253618368. Its totient is φ = 193536000.

The previous prime is 855805441. The next prime is 855805549. The reversal of 855805500 is 5508558.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 7573444 + ... + 7573556.

Almost surely, 2^855805500 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 855805500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1626809184).

855805500 is an abundant number, since it is smaller than the sum of its proper divisors (2397812868).

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

855805500 is a wasteful number, since it uses less digits than its factorization.

855805500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 36.

The square root of 855805500 is about 29254.1535512481. The cubic root of 855805500 is about 949.4199598606.

The spelling of 855805500 in words is "eight hundred fifty-five million, eight hundred five thousand, five hundred".