1868444928 has 432 divisors, whose sum is σ = 6691565440. Its totient is φ = 503635968.

The previous prime is 1868444899. The next prime is 1868444947. The reversal of 1868444928 is 8294448681.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (432).

It is a Harshad number since it is a multiple of its sum of digits (54).

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

Its product of digits (3538944) is a multiple of the sum of its prime divisors (108).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25595100 + ... + 25595172.

Almost surely, 2^1868444928 is an apocalyptic number.

1868444928 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 1868444928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3345782720).

1868444928 is an abundant number, since it is smaller than the sum of its proper divisors (4823120512).

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

1868444928 is an equidigital number, since it uses as much as digits as its factorization.

1868444928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151 (or 108 counting only the distinct ones).

The product of its digits is 3538944, while the sum is 54.

The square root of 1868444928 is about 43225.5124665978. The cubic root of 1868444928 is about 1231.6673639558.

The spelling of 1868444928 in words is "one billion, eight hundred sixty-eight million, four hundred forty-four thousand, nine hundred twenty-eight".