1278616828 has 12 divisors (see below), whose sum is σ = 2334865680. Its totient is φ = 611512352.

The previous prime is 1278616819. The next prime is 1278616853. The reversal of 1278616828 is 8286168721.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6948913 + ... + 6949096.

It is an arithmetic number, because the mean of its divisors is an integer number (194572140).

Almost surely, 2^1278616828 is an apocalyptic number.

It is an amenable number.

1278616828 is a deficient number, since it is larger than the sum of its proper divisors (1056248852).

1278616828 is a wasteful number, since it uses less digits than its factorization.

1278616828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13898036 (or 13898034 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 1278616828 is about 35757.7519986925. The cubic root of 1278616828 is about 1085.3758112595.

It can be divided in two parts, 127861 and 6828, that added together give a square (134689 = 367²).

The spelling of 1278616828 in words is "one billion, two hundred seventy-eight million, six hundred sixteen thousand, eight hundred twenty-eight".