1280643052 has 24 divisors (see below), whose sum is σ = 2420391456. Its totient is φ = 589383168.

The previous prime is 1280643047. The next prime is 1280643061. The reversal of 1280643052 is 2503460821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16528 + ... + 53239.

It is an arithmetic number, because the mean of its divisors is an integer number (100849644).

Almost surely, 2^1280643052 is an apocalyptic number.

It is an amenable number.

1280643052 is a deficient number, since it is larger than the sum of its proper divisors (1139748404).

1280643052 is a wasteful number, since it uses less digits than its factorization.

1280643052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70137 (or 70135 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 1280643052 is about 35786.0734364641. The cubic root of 1280643052 is about 1085.9488403310.

The spelling of 1280643052 in words is "one billion, two hundred eighty million, six hundred forty-three thousand, fifty-two".