1278894240 has 288 divisors, whose sum is σ = 4792329360. Its totient is φ = 308625408.

The previous prime is 1278894223. The next prime is 1278894259. The reversal of 1278894240 is 424988721.

It can be written as a sum of positive squares in 8 ways, for example, as 660078864 + 618815376 = 25692^2 + 24876^2 .

It is a tau number, because it is divible by the number of its divisors (288).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 991516 + ... + 992804.

Almost surely, 2^1278894240 is an apocalyptic number.

1278894240 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 1278894240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2396164680).

1278894240 is an abundant number, since it is smaller than the sum of its proper divisors (3513435120).

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

1278894240 is a wasteful number, since it uses less digits than its factorization.

1278894240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376 (or 1365 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 45.

The square root of 1278894240 is about 35761.6308352961. The cubic root of 1278894240 is about 1085.4543008938.

The spelling of 1278894240 in words is "one billion, two hundred seventy-eight million, eight hundred ninety-four thousand, two hundred forty".