1280711828 has 24 divisors (see below), whose sum is σ = 2501859360. Its totient is φ = 568602720.

The previous prime is 1280711827. The next prime is 1280711857. The reversal of 1280711828 is 8281170821.

It is a junction number, because it is equal to n+sod(n) for n = 1280711791 and 1280711800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280711827) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 336563 + ... + 340346.

It is an arithmetic number, because the mean of its divisors is an integer number (104244140).

Almost surely, 2^1280711828 is an apocalyptic number.

It is an amenable number.

1280711828 is a deficient number, since it is larger than the sum of its proper divisors (1221147532).

1280711828 is a wasteful number, since it uses less digits than its factorization.

1280711828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676967 (or 676965 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 38.

The square root of 1280711828 is about 35787.0343560346. The cubic root of 1280711828 is about 1085.9682800128.

The spelling of 1280711828 in words is "one billion, two hundred eighty million, seven hundred eleven thousand, eight hundred twenty-eight".