1280645675 has 6 divisors (see below), whose sum is σ = 1588000668. Its totient is φ = 1024516520.

The previous prime is 1280645669. The next prime is 1280645689. The reversal of 1280645675 is 5765460821.

It is not a de Polignac number, because 1280645675 - 2¹⁶ = 1280580139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 25612889 + ... + 25612938.

It is an arithmetic number, because the mean of its divisors is an integer number (264666778).

Almost surely, 2^1280645675 is an apocalyptic number.

1280645675 is a deficient number, since it is larger than the sum of its proper divisors (307354993).

1280645675 is an equidigital number, since it uses as much as digits as its factorization.

1280645675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51225837 (or 51225832 counting only the distinct ones).

The product of its (nonzero) digits is 403200, while the sum is 44.

The square root of 1280645675 is about 35786.1100847801. The cubic root of 1280645675 is about 1085.9495817402.

The spelling of 1280645675 in words is "one billion, two hundred eighty million, six hundred forty-five thousand, six hundred seventy-five".