1299529728 has 180 divisors, whose sum is σ = 4293787680. Its totient is φ = 370999296.

The previous prime is 1299529717. The next prime is 1299529729. The reversal of 1299529728 is 8279259921.

1299529728 is a `hidden beast` number, since 1 + 2 + 99 + 529 + 7 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1299529729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1031563 + ... + 1032821.

It is an arithmetic number, because the mean of its divisors is an integer number (23854376).

Almost surely, 2^1299529728 is an apocalyptic number.

1299529728 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 1299529728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2146893840).

1299529728 is an abundant number, since it is smaller than the sum of its proper divisors (2994257952).

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

1299529728 is an equidigital number, since it uses as much as digits as its factorization.

1299529728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1300 (or 1271 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 54.

The square root of 1299529728 is about 36048.9906654819. The cubic root of 1299529728 is about 1091.2612642366.

The spelling of 1299529728 in words is "one billion, two hundred ninety-nine million, five hundred twenty-nine thousand, seven hundred twenty-eight".