1019404728 has 72 divisors (see below), whose sum is σ = 2932906080. Its totient is φ = 319806720.

The previous prime is 1019404717. The next prime is 1019404747. The reversal of 1019404728 is 8274049101.

1019404728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1019404692 and 1019404701.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3688 + ... + 45303.

Almost surely, 2^1019404728 is an apocalyptic number.

1019404728 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 1019404728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1466453040).

1019404728 is an abundant number, since it is smaller than the sum of its proper divisors (1913501352).

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

1019404728 is a wasteful number, since it uses less digits than its factorization.

1019404728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49037 (or 49013 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 1019404728 is about 31928.1181405983. The cubic root of 1019404728 is about 1006.4268497828.

The spelling of 1019404728 in words is "one billion, nineteen million, four hundred four thousand, seven hundred twenty-eight".