1278706540 has 12 divisors (see below), whose sum is σ = 2685283776. Its totient is φ = 511482608.

The previous prime is 1278706511. The next prime is 1278706543. The reversal of 1278706540 is 456078721.

It is a junction number, because it is equal to n+sod(n) for n = 1278706493 and 1278706502.

It is not an unprimeable number, because it can be changed into a prime (1278706543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31967644 + ... + 31967683.

It is an arithmetic number, because the mean of its divisors is an integer number (223773648).

Almost surely, 2^1278706540 is an apocalyptic number.

1278706540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1278706540 is an abundant number, since it is smaller than the sum of its proper divisors (1406577236).

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

1278706540 is a wasteful number, since it uses less digits than its factorization.

1278706540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63935336 (or 63935334 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 1278706540 is about 35759.0064179641. The cubic root of 1278706540 is about 1085.4011951888.

The spelling of 1278706540 in words is "one billion, two hundred seventy-eight million, seven hundred six thousand, five hundred forty".