1278268260 has 72 divisors (see below), whose sum is σ = 3699069696. Its totient is φ = 329477760.

The previous prime is 1278268249. The next prime is 1278268261. The reversal of 1278268260 is 628628721.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278268261) 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 23 ways as a sum of consecutive naturals, for example, 1541526 + ... + 1542354.

It is an arithmetic number, because the mean of its divisors is an integer number (51375968).

Almost surely, 2^1278268260 is an apocalyptic number.

1278268260 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 1278268260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1849534848).

1278268260 is an abundant number, since it is smaller than the sum of its proper divisors (2420801436).

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

1278268260 is an equidigital number, since it uses as much as digits as its factorization.

1278268260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1701 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 42.

The square root of 1278268260 is about 35752.8776464217. The cubic root of 1278268260 is about 1085.2771729884.

The spelling of 1278268260 in words is "one billion, two hundred seventy-eight million, two hundred sixty-eight thousand, two hundred sixty".