1278605328 has 480 divisors, whose sum is σ = 4705413120. Its totient is φ = 289935360.

The previous prime is 1278605327. The next prime is 1278605333. The reversal of 1278605328 is 8235068721.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 1278605328.

It is not an unprimeable number, because it can be changed into a prime (1278605327) 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 95 ways as a sum of consecutive naturals, for example, 14366308 + ... + 14366396.

It is an arithmetic number, because the mean of its divisors is an integer number (9802944).

Almost surely, 2^1278605328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1278605328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2352706560).

1278605328 is an abundant number, since it is smaller than the sum of its proper divisors (3426807792).

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

1278605328 is a wasteful number, since it uses less digits than its factorization.

1278605328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 1278605328 is about 35757.5911940388. The cubic root of 1278605328 is about 1085.3725572590.

It can be divided in two parts, 1278 and 605328, that added together give a palindrome (606606).

The spelling of 1278605328 in words is "one billion, two hundred seventy-eight million, six hundred five thousand, three hundred twenty-eight".