1287257895980 has 24 divisors (see below), whose sum is σ = 3089418950688. Its totient is φ = 441345564288.

The previous prime is 1287257895947. The next prime is 1287257895997. The reversal of 1287257895980 is 895987527821.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4597349489 + ... + 4597349768.

It is an arithmetic number, because the mean of its divisors is an integer number (128725789612).

Almost surely, 2^{1287257895980} is an apocalyptic number.

1287257895980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1287257895980 is an abundant number, since it is smaller than the sum of its proper divisors (1802161054708).

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

1287257895980 is a wasteful number, since it uses less digits than its factorization.

1287257895980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9194699273 (or 9194699271 counting only the distinct ones).

The product of its (nonzero) digits is 203212800, while the sum is 71.

The spelling of 1287257895980 in words is "one trillion, two hundred eighty-seven billion, two hundred fifty-seven million, eight hundred ninety-five thousand, nine hundred eighty".