1278876885 has 64 divisors (see below), whose sum is σ = 2434682880. Its totient is φ = 565044480.

The previous prime is 1278876881. The next prime is 1278876899. The reversal of 1278876885 is 5886788721.

It is not a de Polignac number, because 1278876885 - 2² = 1278876881 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278876881) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 165682 + ... + 173228.

It is an arithmetic number, because the mean of its divisors is an integer number (38041920).

Almost surely, 2^1278876885 is an apocalyptic number.

1278876885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1278876885 is a deficient number, since it is larger than the sum of its proper divisors (1155805995).

1278876885 is a wasteful number, since it uses less digits than its factorization.

1278876885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7658.

The product of its digits is 12042240, while the sum is 60.

The square root of 1278876885 is about 35761.3881861429. The cubic root of 1278876885 is about 1085.4493908853.

The spelling of 1278876885 in words is "one billion, two hundred seventy-eight million, eight hundred seventy-six thousand, eight hundred eighty-five".