1851666828 has 96 divisors (see below), whose sum is σ = 4892203008. Its totient is φ = 540019200.

The previous prime is 1851666757. The next prime is 1851666829. The reversal of 1851666828 is 8286661581.

It is a happy number.

1851666828 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (1851666829) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 804976 + ... + 807272.

It is an arithmetic number, because the mean of its divisors is an integer number (50960448).

Almost surely, 2^1851666828 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1851666828, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2446101504).

1851666828 is an abundant number, since it is smaller than the sum of its proper divisors (3040536180).

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

1851666828 is a wasteful number, since it uses less digits than its factorization.

1851666828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543 (or 2541 counting only the distinct ones).

The product of its digits is 1105920, while the sum is 51.

The square root of 1851666828 is about 43030.9984546025. The cubic root of 1851666828 is about 1227.9696001627.

The spelling of 1851666828 in words is "one billion, eight hundred fifty-one million, six hundred sixty-six thousand, eight hundred twenty-eight".