1280297638950 has 48 divisors (see below), whose sum is σ = 3463787071296. Its totient is φ = 310375184800.

The previous prime is 1280297638897. The next prime is 1280297638969. The reversal of 1280297638950 is 598367920821.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 387967332 + ... + 387970631.

It is an arithmetic number, because the mean of its divisors is an integer number (72162230652).

Almost surely, 2^{1280297638950} is an apocalyptic number.

1280297638950 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1280297638950 is an abundant number, since it is smaller than the sum of its proper divisors (2183489432346).

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

1280297638950 is a wasteful number, since it uses less digits than its factorization.

1280297638950 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 775937989 (or 775937984 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 1280297638950 in words is "one trillion, two hundred eighty billion, two hundred ninety-seven million, six hundred thirty-eight thousand, nine hundred fifty".