1280000002 has 16 divisors (see below), whose sum is σ = 2014683840. Its totient is φ = 608750032.

The previous prime is 1279999997. The next prime is 1280000003. The reversal of 1280000002 is 2000000821.

It is not an unprimeable number, because it can be changed into a prime (1280000003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69493 + ... + 85960.

It is an arithmetic number, because the mean of its divisors is an integer number (125917740).

Almost surely, 2^1280000002 is an apocalyptic number.

1280000002 is a deficient number, since it is larger than the sum of its proper divisors (734683838).

1280000002 is a wasteful number, since it uses less digits than its factorization.

1280000002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155657.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 1280000002 is about 35777.0876679475. The cubic root of 1280000002 is about 1085.7670472035.

Adding to 1280000002 its reverse (2000000821), we get a palindrome (3280000823).

It can be divided in two parts, 128000000 and 2, that multiplied together give a square (256000000 = 16000²).

The spelling of 1280000002 in words is "one billion, two hundred eighty million, two", and thus it is an aban number.