1280638674 has 112 divisors (see below), whose sum is σ = 3314675520. Its totient is φ = 363333600.

The previous prime is 1280638661. The next prime is 1280638687. The reversal of 1280638674 is 4768360821.

1280638674 is a `hidden beast` number, since 1 + 2 + 8 + 0 + 638 + 6 + 7 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (1280638661) and next prime (1280638687).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 1826524 + ... + 1827224.

Almost surely, 2^1280638674 is an apocalyptic number.

1280638674 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1280638674, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1657337760).

1280638674 is an abundant number, since it is smaller than the sum of its proper divisors (2034036846).

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

1280638674 is an equidigital number, since it uses as much as digits as its factorization.

1280638674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907 (or 892 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 1280638674 is about 35786.0122673650. The cubic root of 1280638674 is about 1085.9476028564.

The spelling of 1280638674 in words is "one billion, two hundred eighty million, six hundred thirty-eight thousand, six hundred seventy-four".