1280865808 has 40 divisors (see below), whose sum is σ = 2540373120. Its totient is φ = 625349760.

The previous prime is 1280865767. The next prime is 1280865809. The reversal of 1280865808 is 8085680821.

It is not an unprimeable number, because it can be changed into a prime (1280865809) 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, 367498 + ... + 370966.

It is an arithmetic number, because the mean of its divisors is an integer number (63509328).

Almost surely, 2^1280865808 is an apocalyptic number.

It is an amenable number.

1280865808 is a deficient number, since it is larger than the sum of its proper divisors (1259507312).

1280865808 is a wasteful number, since it uses less digits than its factorization.

1280865808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4015 (or 4009 counting only the distinct ones).

The product of its (nonzero) digits is 245760, while the sum is 46.

The square root of 1280865808 is about 35789.1856291813. The cubic root of 1280865808 is about 1086.0118002623.

The spelling of 1280865808 in words is "one billion, two hundred eighty million, eight hundred sixty-five thousand, eight hundred eight".