851455820 has 24 divisors (see below), whose sum is σ = 1791180384. Its totient is φ = 339987456.

The previous prime is 851455819. The next prime is 851455823. The reversal of 851455820 is 28554158.

It is not an unprimeable number, because it can be changed into a prime (851455823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25352 + ... + 48431.

It is an arithmetic number, because the mean of its divisors is an integer number (74632516).

Almost surely, 2^851455820 is an apocalyptic number.

It is an amenable number.

851455820 is an abundant number, since it is smaller than the sum of its proper divisors (939724564).

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

851455820 is a wasteful number, since it uses less digits than its factorization.

851455820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74369 (or 74367 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 38.

The square root of 851455820 is about 29179.7158999192. The cubic root of 851455820 is about 947.8087334522.

The spelling of 851455820 in words is "eight hundred fifty-one million, four hundred fifty-five thousand, eight hundred twenty".