1278840648 has 32 divisors (see below), whose sum is σ = 3198016800. Its totient is φ = 426158208.

The previous prime is 1278840601. The next prime is 1278840649. The reversal of 1278840648 is 8460488721.

It is a super-3 number, since 3×1278840648³ (a number of 28 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1278840597 and 1278840606.

It is not an unprimeable number, because it can be changed into a prime (1278840649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125140 + ... + 134972.

It is an arithmetic number, because the mean of its divisors is an integer number (99938025).

Almost surely, 2^1278840648 is an apocalyptic number.

It is an amenable number.

1278840648 is an abundant number, since it is smaller than the sum of its proper divisors (1919176152).

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

1278840648 is a wasteful number, since it uses less digits than its factorization.

1278840648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15261 (or 15257 counting only the distinct ones).

The product of its (nonzero) digits is 688128, while the sum is 48.

The square root of 1278840648 is about 35760.8815327587. The cubic root of 1278840648 is about 1085.4391387124.

The spelling of 1278840648 in words is "one billion, two hundred seventy-eight million, eight hundred forty thousand, six hundred forty-eight".