1280220016 has 10 divisors (see below), whose sum is σ = 2480426312. Its totient is φ = 640110000.

The previous prime is 1280220001. The next prime is 1280220047. The reversal of 1280220016 is 6100220821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40006860 + ... + 40006891.

Almost surely, 2^1280220016 is an apocalyptic number.

1280220016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1280220016 is a deficient number, since it is larger than the sum of its proper divisors (1200206296).

1280220016 is an equidigital number, since it uses as much as digits as its factorization.

1280220016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80013759 (or 80013753 counting only the distinct ones).

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

The square root of 1280220016 is about 35780.1623249532. The cubic root of 1280220016 is about 1085.8292530017.

Adding to 1280220016 its reverse (6100220821), we get a palindrome (7380440837).

The spelling of 1280220016 in words is "one billion, two hundred eighty million, two hundred twenty thousand, sixteen".