1273201280 has 128 divisors (see below), whose sum is σ = 3304763280. Its totient is φ = 466255872.

The previous prime is 1273201273. The next prime is 1273201291. The reversal of 1273201280 is 821023721.

It can be written as a sum of positive squares in 8 ways, for example, as 94789696 + 1178411584 = 9736^2 + 34328^2 .

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1139282 + ... + 1140398.

Almost surely, 2^1273201280 is an apocalyptic number.

1273201280 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 1273201280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1652381640).

1273201280 is an abundant number, since it is smaller than the sum of its proper divisors (2031562000).

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

1273201280 is a wasteful number, since it uses less digits than its factorization.

1273201280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1286 (or 1274 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 26.

The square root of 1273201280 is about 35681.9461352657. The cubic root of 1273201280 is about 1083.8412824813.

The spelling of 1273201280 in words is "one billion, two hundred seventy-three million, two hundred one thousand, two hundred eighty".