1866686328 has 96 divisors (see below), whose sum is σ = 5620218240. Its totient is φ = 555828480.

The previous prime is 1866686303. The next prime is 1866686383. The reversal of 1866686328 is 8236866681.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3151 + ... + 61182.

It is an arithmetic number, because the mean of its divisors is an integer number (58543940).

Almost surely, 2^1866686328 is an apocalyptic number.

1866686328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1866686328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2810109120).

1866686328 is an abundant number, since it is smaller than the sum of its proper divisors (3753531912).

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

1866686328 is a wasteful number, since it uses less digits than its factorization.

1866686328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64389 (or 64382 counting only the distinct ones).

The product of its digits is 3981312, while the sum is 54.

The square root of 1866686328 is about 43205.1655245064. The cubic root of 1866686328 is about 1231.2808232365.

The spelling of 1866686328 in words is "one billion, eight hundred sixty-six million, six hundred eighty-six thousand, three hundred twenty-eight".