1298809728 has 224 divisors, whose sum is σ = 4013496000. Its totient is φ = 418037760.

The previous prime is 1298809723. The next prime is 1298809751. The reversal of 1298809728 is 8279088921.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1298809723) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 2892448 + ... + 2892896.

Almost surely, 2^1298809728 is an apocalyptic number.

1298809728 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 1298809728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2006748000).

1298809728 is an abundant number, since it is smaller than the sum of its proper divisors (2714686272).

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

1298809728 is an frugal number, since it uses more digits than its factorization.

1298809728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512 (or 485 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 54.

The square root of 1298809728 is about 36039.0028718887. The cubic root of 1298809728 is about 1091.0596904816.

The spelling of 1298809728 in words is "one billion, two hundred ninety-eight million, eight hundred nine thousand, seven hundred twenty-eight".