1278008225 has 24 divisors (see below), whose sum is σ = 1780844352. Its totient is φ = 902721600.

The previous prime is 1278008219. The next prime is 1278008233. The reversal of 1278008225 is 5228008721.

It is not a de Polignac number, because 1278008225 - 2⁴ = 1278008209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78011 + ... + 92960.

It is an arithmetic number, because the mean of its divisors is an integer number (74201848).

Almost surely, 2^1278008225 is an apocalyptic number.

It is an amenable number.

1278008225 is a deficient number, since it is larger than the sum of its proper divisors (502836127).

1278008225 is a wasteful number, since it uses less digits than its factorization.

1278008225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171017 (or 171012 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 35.

The square root of 1278008225 is about 35749.2409010317. The cubic root of 1278008225 is about 1085.2035762333.

The spelling of 1278008225 in words is "one billion, two hundred seventy-eight million, eight thousand, two hundred twenty-five".