855445920 has 288 divisors, whose sum is σ = 3222592128. Its totient is φ = 190052352.

The previous prime is 855445867. The next prime is 855445939. The reversal of 855445920 is 29544558.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 869749 + ... + 870731.

It is an arithmetic number, because the mean of its divisors is an integer number (11189556).

Almost surely, 2^855445920 is an apocalyptic number.

855445920 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 855445920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1611296064).

855445920 is an abundant number, since it is smaller than the sum of its proper divisors (2367146208).

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

855445920 is a wasteful number, since it uses less digits than its factorization.

855445920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052 (or 1037 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 42.

The square root of 855445920 is about 29248.0071115965. The cubic root of 855445920 is about 949.2869700421.

The spelling of 855445920 in words is "eight hundred fifty-five million, four hundred forty-five thousand, nine hundred twenty".