1278684288 has 96 divisors (see below), whose sum is σ = 4205223360. Its totient is φ = 365336064.

The previous prime is 1278684263. The next prime is 1278684289. The reversal of 1278684288 is 8824868721.

It is a tau number, because it is divible by the number of its divisors (96).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (1278684289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71220 + ... + 87347.

It is an arithmetic number, because the mean of its divisors is an integer number (43804410).

Almost surely, 2^1278684288 is an apocalyptic number.

1278684288 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1278684288 is an abundant number, since it is smaller than the sum of its proper divisors (2926539072).

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

1278684288 is a wasteful number, since it uses less digits than its factorization.

1278684288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158594 (or 158579 counting only the distinct ones).

The product of its digits is 2752512, while the sum is 54.

The square root of 1278684288 is about 35758.6952782117. The cubic root of 1278684288 is about 1085.3948991163.

The spelling of 1278684288 in words is "one billion, two hundred seventy-eight million, six hundred eighty-four thousand, two hundred eighty-eight".