1273538720 has 96 divisors (see below), whose sum is σ = 3120586560. Its totient is φ = 490792960.

The previous prime is 1273538701. The next prime is 1273538737. The reversal of 1273538720 is 278353721.

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 15 ways as a sum of consecutive naturals, for example, 543311 + ... + 545649.

It is an arithmetic number, because the mean of its divisors is an integer number (32506110).

Almost surely, 2^1273538720 is an apocalyptic number.

1273538720 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 1273538720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1560293280).

1273538720 is an abundant number, since it is smaller than the sum of its proper divisors (1847047840).

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

1273538720 is a wasteful number, since it uses less digits than its factorization.

1273538720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478 (or 2470 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 1273538720 is about 35686.6742636520. The cubic root of 1273538720 is about 1083.9370251583.

The spelling of 1273538720 in words is "one billion, two hundred seventy-three million, five hundred thirty-eight thousand, seven hundred twenty".