1272664340 has 12 divisors (see below), whose sum is σ = 2672595156. Its totient is φ = 509065728.

The previous prime is 1272664339. The next prime is 1272664357. The reversal of 1272664340 is 434662721.

It can be written as a sum of positive squares in 2 ways, for example, as 1001469316 + 271195024 = 31646^2 + 16468^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1272664340.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31816589 + ... + 31816628.

It is an arithmetic number, because the mean of its divisors is an integer number (222716263).

Almost surely, 2^1272664340 is an apocalyptic number.

1272664340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1272664340 is an abundant number, since it is smaller than the sum of its proper divisors (1399930816).

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

1272664340 is a wasteful number, since it uses less digits than its factorization.

1272664340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63633226 (or 63633224 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 35.

The square root of 1272664340 is about 35674.4213688183. The cubic root of 1272664340 is about 1083.6889002997.

The spelling of 1272664340 in words is "one billion, two hundred seventy-two million, six hundred sixty-four thousand, three hundred forty".