1286631094878 has 64 divisors (see below), whose sum is σ = 2985297707520. Its totient is φ = 409981974336.

The previous prime is 1286631094871. The next prime is 1286631094883. The reversal of 1286631094878 is 8784901366821.

1286631094878 is a `hidden beast` number, since 1 + 2 + 86 + 63 + 10 + 9 + 487 + 8 = 666.

It is a super-2 number, since 2×1286631094878² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1286631094871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1745401 + ... + 2370587.

It is an arithmetic number, because the mean of its divisors is an integer number (46645276680).

Almost surely, 2^{1286631094878} is an apocalyptic number.

1286631094878 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1286631094878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492648853760).

1286631094878 is an abundant number, since it is smaller than the sum of its proper divisors (1698666612642).

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

1286631094878 is a wasteful number, since it uses less digits than its factorization.

1286631094878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626878 (or 626872 counting only the distinct ones).

The product of its (nonzero) digits is 27869184, while the sum is 63.

The spelling of 1286631094878 in words is "one trillion, two hundred eighty-six billion, six hundred thirty-one million, ninety-four thousand, eight hundred seventy-eight".