1287887796 has 192 divisors, whose sum is σ = 3804595200. Its totient is φ = 373911552.

The previous prime is 1287887789. The next prime is 1287887831. The reversal of 1287887796 is 6977887821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1913316 + ... + 1913988.

It is an arithmetic number, because the mean of its divisors is an integer number (19815600).

Almost surely, 2^1287887796 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1287887796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1902297600).

1287887796 is an abundant number, since it is smaller than the sum of its proper divisors (2516707404).

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

1287887796 is a wasteful number, since it uses less digits than its factorization.

1287887796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 767 counting only the distinct ones).

The product of its digits is 18966528, while the sum is 63.

The square root of 1287887796 is about 35887.1536346922. The cubic root of 1287887796 is about 1087.9927697851.

The spelling of 1287887796 in words is "one billion, two hundred eighty-seven million, eight hundred eighty-seven thousand, seven hundred ninety-six".