855618720 has 192 divisors, whose sum is σ = 2955004416. Its totient is φ = 206382080.

The previous prime is 855618713. The next prime is 855618727. The reversal of 855618720 is 27816558.

It is an interprime number because it is at equal distance from previous prime (855618713) and next prime (855618727).

It is not an unprimeable number, because it can be changed into a prime (855618727) 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 31 ways as a sum of consecutive naturals, for example, 1831927 + ... + 1832393.

It is an arithmetic number, because the mean of its divisors is an integer number (15390648).

Almost surely, 2^855618720 is an apocalyptic number.

855618720 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 855618720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1477502208).

855618720 is an abundant number, since it is smaller than the sum of its proper divisors (2099385696).

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

855618720 is a wasteful number, since it uses less digits than its factorization.

855618720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843 (or 835 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 42.

The square root of 855618720 is about 29250.9610098540. The cubic root of 855618720 is about 949.3508843667.

The spelling of 855618720 in words is "eight hundred fifty-five million, six hundred eighteen thousand, seven hundred twenty".