1285887518244 has 144 divisors (see below), whose sum is σ = 3856787450880. Its totient is φ = 353489391360.

The previous prime is 1285887518231. The next prime is 1285887518261. The reversal of 1285887518244 is 4428157885821.

It is a happy number.

1285887518244 is a `hidden beast` number, since 1 + 2 + 8 + 588 + 7 + 5 + 1 + 8 + 2 + 44 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 875742 + ... + 1827210.

Almost surely, 2^{1285887518244} is an apocalyptic number.

1285887518244 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1285887518244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1928393725440).

1285887518244 is an abundant number, since it is smaller than the sum of its proper divisors (2570899932636).

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

1285887518244 is a wasteful number, since it uses less digits than its factorization.

1285887518244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 951690 (or 951685 counting only the distinct ones).

The product of its digits is 45875200, while the sum is 63.

The spelling of 1285887518244 in words is "one trillion, two hundred eighty-five billion, eight hundred eighty-seven million, five hundred eighteen thousand, two hundred forty-four".