855798978 has 8 divisors (see below), whose sum is σ = 1711597968. Its totient is φ = 285266324.

The previous prime is 855798971. The next prime is 855799001. The reversal of 855798978 is 879897558.

It is a sphenic number, since it is the product of 3 distinct primes.

855798978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (855798971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71316576 + ... + 71316587.

It is an arithmetic number, because the mean of its divisors is an integer number (213949746).

Almost surely, 2^855798978 is an apocalyptic number.

855798978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

855798978 is a wasteful number, since it uses less digits than its factorization.

855798978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142633168.

The product of its digits is 50803200, while the sum is 66.

The square root of 855798978 is about 29254.0420796853. The cubic root of 855798978 is about 949.4175480459.

The spelling of 855798978 in words is "eight hundred fifty-five million, seven hundred ninety-eight thousand, nine hundred seventy-eight".