856555080 has 64 divisors (see below), whose sum is σ = 2575117440. Its totient is φ = 227930112.

The previous prime is 856555061. The next prime is 856555087. The reversal of 856555080 is 80555658.

It is not an unprimeable number, because it can be changed into a prime (856555087) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51112 + ... + 65768.

It is an arithmetic number, because the mean of its divisors is an integer number (40236210).

Almost surely, 2^856555080 is an apocalyptic number.

It is an amenable number.

856555080 is an abundant number, since it is smaller than the sum of its proper divisors (1718562360).

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

856555080 is a wasteful number, since it uses less digits than its factorization.

856555080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15158 (or 15154 counting only the distinct ones).

The product of its (nonzero) digits is 240000, while the sum is 42.

The square root of 856555080 is about 29266.9622612255. The cubic root of 856555080 is about 949.6970705426.

The spelling of 856555080 in words is "eight hundred fifty-six million, five hundred fifty-five thousand, eighty".