1987210639236 has 96 divisors (see below), whose sum is σ = 4924200960000. Its totient is φ = 621978715008.

The previous prime is 1987210639159. The next prime is 1987210639283. The reversal of 1987210639236 is 6329360127891.

It is a super-4 number, since 4×1987210639236⁴ (a number of 50 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29472490 + ... + 29539838.

It is an arithmetic number, because the mean of its divisors is an integer number (51293760000).

Almost surely, 2^{1987210639236} 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 1987210639236, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2462100480000).

1987210639236 is an abundant number, since it is smaller than the sum of its proper divisors (2936990320764).

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

1987210639236 is a wasteful number, since it uses less digits than its factorization.

1987210639236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68521 (or 68519 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 57.

The spelling of 1987210639236 in words is "one trillion, nine hundred eighty-seven billion, two hundred ten million, six hundred thirty-nine thousand, two hundred thirty-six".