855320520 has 64 divisors (see below), whose sum is σ = 2591403840. Its totient is φ = 225824000.

The previous prime is 855320513. The next prime is 855320537. The reversal of 855320520 is 25023558.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 23166 + ... + 47405.

It is an arithmetic number, because the mean of its divisors is an integer number (40490685).

Almost surely, 2^855320520 is an apocalyptic number.

It is an amenable number.

855320520 is an abundant number, since it is smaller than the sum of its proper divisors (1736083320).

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

855320520 is a wasteful number, since it uses less digits than its factorization.

855320520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70686 (or 70682 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 855320520 is about 29245.8632972255. The cubic root of 855320520 is about 949.2405823822.

The spelling of 855320520 in words is "eight hundred fifty-five million, three hundred twenty thousand, five hundred twenty".