1280380000 has 60 divisors (see below), whose sum is σ = 3149976060. Its totient is φ = 512144000.

The previous prime is 1280379977. The next prime is 1280380009. The reversal of 1280380000 is 830821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280380009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 12010 + ... + 52009.

It is an arithmetic number, because the mean of its divisors is an integer number (52499601).

Almost surely, 2^1280380000 is an apocalyptic number.

1280380000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280380000 is an abundant number, since it is smaller than the sum of its proper divisors (1869596060).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1280380000 is an frugal number, since it uses more digits than its factorization.

1280380000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64049 (or 64026 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1280380000 is about 35782.3979073510. The cubic root of 1280380000 is about 1085.8744817044.

The spelling of 1280380000 in words is "one billion, two hundred eighty million, three hundred eighty thousand".