1281670128620 has 48 divisors (see below), whose sum is σ = 3076072796160. Its totient is φ = 439420545984.

The previous prime is 1281670128611. The next prime is 1281670128647. The reversal of 1281670128620 is 268210761821.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12353321 + ... + 12456639.

It is an arithmetic number, because the mean of its divisors is an integer number (64084849920).

Almost surely, 2^{1281670128620} is an apocalyptic number.

1281670128620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281670128620 is an abundant number, since it is smaller than the sum of its proper divisors (1794402667540).

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

1281670128620 is a wasteful number, since it uses less digits than its factorization.

1281670128620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191942 (or 191940 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The spelling of 1281670128620 in words is "one trillion, two hundred eighty-one billion, six hundred seventy million, one hundred twenty-eight thousand, six hundred twenty".