1278216548 has 18 divisors (see below), whose sum is σ = 2602084086. Its totient is φ = 547807008.

The previous prime is 1278216539. The next prime is 1278216607. The reversal of 1278216548 is 8456128721.

It can be written as a sum of positive squares in only one way, i.e., 1044065344 + 234151204 = 32312^2 + 15302^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1278216499 and 1278216508.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3260561 + ... + 3260952.

It is an arithmetic number, because the mean of its divisors is an integer number (144560227).

Almost surely, 2^1278216548 is an apocalyptic number.

It is an amenable number.

1278216548 is an abundant number, since it is smaller than the sum of its proper divisors (1323867538).

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

1278216548 is a wasteful number, since it uses less digits than its factorization.

1278216548 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6521531 (or 6521522 counting only the distinct ones).

The product of its digits is 215040, while the sum is 44.

The square root of 1278216548 is about 35752.1544525641. The cubic root of 1278216548 is about 1085.2625379253.

The spelling of 1278216548 in words is "one billion, two hundred seventy-eight million, two hundred sixteen thousand, five hundred forty-eight".