1278275328 has 216 divisors, whose sum is σ = 4152884736. Its totient is φ = 374630400.

The previous prime is 1278275261. The next prime is 1278275381. The reversal of 1278275328 is 8235728721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 784851 + ... + 786477.

Almost surely, 2^1278275328 is an apocalyptic number.

1278275328 is a gapful number since it is divisible by the number (18) 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 1278275328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2076442368).

1278275328 is an abundant number, since it is smaller than the sum of its proper divisors (2874609408).

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

1278275328 is a wasteful number, since it uses less digits than its factorization.

1278275328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691 (or 1674 counting only the distinct ones).

The product of its digits is 376320, while the sum is 45.

The square root of 1278275328 is about 35752.9764914755. The cubic root of 1278275328 is about 1085.2791732792.

The spelling of 1278275328 in words is "one billion, two hundred seventy-eight million, two hundred seventy-five thousand, three hundred twenty-eight".