851811378 has 32 divisors (see below), whose sum is σ = 1875882240. Its totient is φ = 255710160.

The previous prime is 851811349. The next prime is 851811383. The reversal of 851811378 is 873118158.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53248 + ... + 67371.

It is an arithmetic number, because the mean of its divisors is an integer number (58621320).

Almost surely, 2^851811378 is an apocalyptic number.

851811378 is an abundant number, since it is smaller than the sum of its proper divisors (1024070862).

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

851811378 is a wasteful number, since it uses less digits than its factorization.

851811378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120742.

The product of its digits is 53760, while the sum is 42.

The square root of 851811378 is about 29185.8078181845. The cubic root of 851811378 is about 947.9406463757.

The spelling of 851811378 in words is "eight hundred fifty-one million, eight hundred eleven thousand, three hundred seventy-eight".