1109647728 has 480 divisors, whose sum is σ = 4071168000. Its totient is φ = 287400960.

The previous prime is 1109647727. The next prime is 1109647729. The reversal of 1109647728 is 8277469011.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1109647727) and next prime (1109647729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1109647727) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12467908 + ... + 12467996.

It is an arithmetic number, because the mean of its divisors is an integer number (8481600).

Almost surely, 2^1109647728 is an apocalyptic number.

1109647728 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 1109647728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2035584000).

1109647728 is an abundant number, since it is smaller than the sum of its proper divisors (2961520272).

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

1109647728 is a wasteful number, since it uses less digits than its factorization.

1109647728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 151 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 45.

The square root of 1109647728 is about 33311.3753543741. The cubic root of 1109647728 is about 1035.2892617247.

The spelling of 1109647728 in words is "one billion, one hundred nine million, six hundred forty-seven thousand, seven hundred twenty-eight".