1280170816 has 14 divisors (see below), whose sum is σ = 2540339090. Its totient is φ = 640085376.

The previous prime is 1280170769. The next prime is 1280170817. The reversal of 1280170816 is 6180710821.

It can be written as a sum of positive squares in only one way, i.e., 1231729216 + 48441600 = 35096^2 + 6960^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280170817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10001271 + ... + 10001398.

Almost surely, 2^1280170816 is an apocalyptic number.

1280170816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1280170816 is a deficient number, since it is larger than the sum of its proper divisors (1260168274).

1280170816 is an equidigital number, since it uses as much as digits as its factorization.

1280170816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20002681 (or 20002671 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 34.

The square root of 1280170816 is about 35779.4747865309. The cubic root of 1280170816 is about 1085.8153430271.

The spelling of 1280170816 in words is "one billion, two hundred eighty million, one hundred seventy thousand, eight hundred sixteen".