1281208528400 has 60 divisors (see below), whose sum is σ = 3078538333332. Its totient is φ = 512411013120.

The previous prime is 1281208528373. The next prime is 1281208528403. The reversal of 1281208528400 is 48258021821.

It can be written as a sum of positive squares in 6 ways, for example, as 411383697664 + 869824830736 = 641392^2 + 932644^2 .

It is not an unprimeable number, because it can be changed into a prime (1281208528403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2654552 + ... + 3099848.

Almost surely, 2^{1281208528400} is an apocalyptic number.

1281208528400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1281208528400 is an abundant number, since it is smaller than the sum of its proper divisors (1797329804932).

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

1281208528400 is a wasteful number, since it uses less digits than its factorization.

1281208528400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452508 (or 452497 counting only the distinct ones).

The product of its (nonzero) digits is 81920, while the sum is 41.

The spelling of 1281208528400 in words is "one trillion, two hundred eighty-one billion, two hundred eight million, five hundred twenty-eight thousand, four hundred".