1278890163 has 48 divisors (see below), whose sum is σ = 1985832576. Its totient is φ = 791700480.

The previous prime is 1278890153. The next prime is 1278890177. The reversal of 1278890163 is 3610988721.

It is not a de Polignac number, because 1278890163 - 2⁴ = 1278890147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1278890153) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 640695 + ... + 642687.

It is an arithmetic number, because the mean of its divisors is an integer number (41371512).

Almost surely, 2^1278890163 is an apocalyptic number.

1278890163 is a deficient number, since it is larger than the sum of its proper divisors (706942413).

1278890163 is a wasteful number, since it uses less digits than its factorization.

1278890163 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2124 (or 2121 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1278890163 is about 35761.5738328167. The cubic root of 1278890163 is about 1085.4531474489.

The spelling of 1278890163 in words is "one billion, two hundred seventy-eight million, eight hundred ninety thousand, one hundred sixty-three".