1863449728 has 64 divisors (see below), whose sum is σ = 4248601920. Its totient is φ = 797506560.

The previous prime is 1863449701. The next prime is 1863449729. The reversal of 1863449728 is 8279443681.

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (1863449729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1148758 + ... + 1150378.

It is an arithmetic number, because the mean of its divisors is an integer number (66384405).

Almost surely, 2^1863449728 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 1863449728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2124300960).

1863449728 is an abundant number, since it is smaller than the sum of its proper divisors (2385152192).

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

1863449728 is a wasteful number, since it uses less digits than its factorization.

1863449728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2925 (or 2913 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 52.

The square root of 1863449728 is about 43167.6931049135. The cubic root of 1863449728 is about 1230.5687827021.

The spelling of 1863449728 in words is "one billion, eight hundred sixty-three million, four hundred forty-nine thousand, seven hundred twenty-eight".