1878261728 has 144 divisors (see below), whose sum is σ = 4703577984. Its totient is φ = 732856320.

The previous prime is 1878261709. The next prime is 1878261767. The reversal of 1878261728 is 8271628781.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 825200 + ... + 827472.

It is an arithmetic number, because the mean of its divisors is an integer number (32663736).

Almost surely, 2^1878261728 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 1878261728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2351788992).

1878261728 is an abundant number, since it is smaller than the sum of its proper divisors (2825316256).

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

1878261728 is a wasteful number, since it uses less digits than its factorization.

1878261728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2345 (or 2330 counting only the distinct ones).

The product of its digits is 602112, while the sum is 50.

The square root of 1878261728 is about 43338.9170146186. The cubic root of 1878261728 is about 1233.8206552095.

The spelling of 1878261728 in words is "one billion, eight hundred seventy-eight million, two hundred sixty-one thousand, seven hundred twenty-eight".