1267728000 has 640 divisors, whose sum is σ = 5348341440. Its totient is φ = 263424000.

The previous prime is 1267727999. The next prime is 1267728019. The reversal of 1267728000 is 8277621.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 115247995 + ... + 115248005.

Almost surely, 2^1267728000 is an apocalyptic number.

1267728000 is a gapful number since it is divisible by the number (10) 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 1267728000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2674170720).

1267728000 is an abundant number, since it is smaller than the sum of its proper divisors (4080613440).

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

1267728000 is an frugal number, since it uses more digits than its factorization.

1267728000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 1267728000 is about 35605.1681641865. The cubic root of 1267728000 is about 1082.2859673522.

The spelling of 1267728000 in words is "one billion, two hundred sixty-seven million, seven hundred twenty-eight thousand".