1299088728 has 384 divisors, whose sum is σ = 4521553920. Its totient is φ = 328458240.

The previous prime is 1299088717. The next prime is 1299088751. The reversal of 1299088728 is 8278809921.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 17795700 + ... + 17795772.

It is an arithmetic number, because the mean of its divisors is an integer number (11774880).

Almost surely, 2^1299088728 is an apocalyptic number.

1299088728 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 1299088728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2260776960).

1299088728 is an abundant number, since it is smaller than the sum of its proper divisors (3222465192).

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

1299088728 is a wasteful number, since it uses less digits than its factorization.

1299088728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207 (or 200 counting only the distinct ones).

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

The square root of 1299088728 is about 36042.8734703547. The cubic root of 1299088728 is about 1091.1378091500.

The spelling of 1299088728 in words is "one billion, two hundred ninety-nine million, eighty-eight thousand, seven hundred twenty-eight".