1273278720 has 432 divisors, whose sum is σ = 4848596928. Its totient is φ = 283852800.

The previous prime is 1273278697. The next prime is 1273278763. The reversal of 1273278720 is 278723721.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12606670 + ... + 12606770.

It is an arithmetic number, because the mean of its divisors is an integer number (11223604).

Almost surely, 2^1273278720 is an apocalyptic number.

1273278720 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 1273278720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2424298464).

1273278720 is an abundant number, since it is smaller than the sum of its proper divisors (3575318208).

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

1273278720 is a wasteful number, since it uses less digits than its factorization.

1273278720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 65856, while the sum is 39.

The square root of 1273278720 is about 35683.0312613713. The cubic root of 1273278720 is about 1083.8632562175.

The spelling of 1273278720 in words is "one billion, two hundred seventy-three million, two hundred seventy-eight thousand, seven hundred twenty".