1278170145 has 192 divisors, whose sum is σ = 2857697280. Its totient is φ = 538876800.

The previous prime is 1278170137. The next prime is 1278170209. The reversal of 1278170145 is 5410718721.

It is not a de Polignac number, because 1278170145 - 2³ = 1278170137 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 4716360 + ... + 4716630.

It is an arithmetic number, because the mean of its divisors is an integer number (14883840).

Almost surely, 2^1278170145 is an apocalyptic number.

1278170145 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278170145 is an abundant number, since it is smaller than the sum of its proper divisors (1579527135).

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

1278170145 is a wasteful number, since it uses less digits than its factorization.

1278170145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353 (or 340 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The square root of 1278170145 is about 35751.5054927761. The cubic root of 1278170145 is about 1085.2494050314.

Adding to 1278170145 its reverse (5410718721), we get a palindrome (6688888866).

The spelling of 1278170145 in words is "one billion, two hundred seventy-eight million, one hundred seventy thousand, one hundred forty-five".