1272839680 has 240 divisors, whose sum is σ = 3624611760. Its totient is φ = 427327488.

The previous prime is 1272839569. The next prime is 1272839693. The reversal of 1272839680 is 869382721.

It is a self number, because there is not a number n which added to its sum of digits gives 1272839680.

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 23 ways as a sum of consecutive naturals, for example, 9157051 + ... + 9157189.

It is an arithmetic number, because the mean of its divisors is an integer number (15102549).

Almost surely, 2^1272839680 is an apocalyptic number.

1272839680 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 1272839680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1812305880).

1272839680 is an abundant number, since it is smaller than the sum of its proper divisors (2351772080).

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

1272839680 is an equidigital number, since it uses as much as digits as its factorization.

1272839680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 46.

The square root of 1272839680 is about 35676.8787872482. The cubic root of 1272839680 is about 1083.7386660497.

The spelling of 1272839680 in words is "one billion, two hundred seventy-two million, eight hundred thirty-nine thousand, six hundred eighty".