1273666560 has 176 divisors, whose sum is σ = 4119088032. Its totient is φ = 335872000.

The previous prime is 1273666547. The next prime is 1273666567. The reversal of 1273666560 is 656663721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1273666567) by changing a digit.

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, 1550950 + ... + 1551770.

Almost surely, 2^1273666560 is an apocalyptic number.

1273666560 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 1273666560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2059544016).

1273666560 is an abundant number, since it is smaller than the sum of its proper divisors (2845421472).

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

1273666560 is a wasteful number, since it uses less digits than its factorization.

1273666560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950 (or 932 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 42.

The square root of 1273666560 is about 35688.4653634756. The cubic root of 1273666560 is about 1083.9732930971.

The spelling of 1273666560 in words is "one billion, two hundred seventy-three million, six hundred sixty-six thousand, five hundred sixty".