851981828 has 12 divisors (see below), whose sum is σ = 1492491840. Its totient is φ = 425555592.

The previous prime is 851981827. The next prime is 851981839. The reversal of 851981828 is 828189158.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (851981827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104408 + ... + 112271.

It is an arithmetic number, because the mean of its divisors is an integer number (124374320).

Almost surely, 2^851981828 is an apocalyptic number.

It is an amenable number.

851981828 is a deficient number, since it is larger than the sum of its proper divisors (640510012).

851981828 is a wasteful number, since it uses less digits than its factorization.

851981828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217666 (or 217664 counting only the distinct ones).

The product of its digits is 368640, while the sum is 50.

The square root of 851981828 is about 29188.7277557622. The cubic root of 851981828 is about 948.0038707433.

The spelling of 851981828 in words is "eight hundred fifty-one million, nine hundred eighty-one thousand, eight hundred twenty-eight".