1278128128 has 26 divisors (see below), whose sum is σ = 2555952404. Its totient is φ = 639062016.

The previous prime is 1278128099. The next prime is 1278128129. The reversal of 1278128128 is 8218218721.

It is a super-3 number, since 3×1278128128³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (1278128129) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151926 + ... + 160117.

Almost surely, 2^1278128128 is an apocalyptic number.

It is an amenable number.

1278128128 is a deficient number, since it is larger than the sum of its proper divisors (1277824276).

1278128128 is an frugal number, since it uses more digits than its factorization.

1278128128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 312067 (or 312045 counting only the distinct ones).

The product of its digits is 28672, while the sum is 40.

The square root of 1278128128 is about 35750.9178623431. The cubic root of 1278128128 is about 1085.2375131811.

The spelling of 1278128128 in words is "one billion, two hundred seventy-eight million, one hundred twenty-eight thousand, one hundred twenty-eight".