1299728800 has 36 divisors (see below), whose sum is σ = 3172964886. Its totient is φ = 519891200.

The previous prime is 1299728797. The next prime is 1299728821. The reversal of 1299728800 is 88279921.

It can be written as a sum of positive squares in 3 ways, for example, as 956293776 + 343435024 = 30924^2 + 18532^2 .

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 811531 + ... + 813130.

Almost surely, 2^1299728800 is an apocalyptic number.

1299728800 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1299728800 is an abundant number, since it is smaller than the sum of its proper divisors (1873236086).

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

1299728800 is a wasteful number, since it uses less digits than its factorization.

1299728800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1624681 (or 1624668 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 1299728800 is about 36051.7516911453. The cubic root of 1299728800 is about 1091.3169840009.

The spelling of 1299728800 in words is "one billion, two hundred ninety-nine million, seven hundred twenty-eight thousand, eight hundred".