39987687105 has 12 divisors (see below), whose sum is σ = 69311991060. Its totient is φ = 21326766432.

The previous prime is 39987687067. The next prime is 39987687119. The reversal of 39987687105 is 50178678993.

39987687105 is a `hidden beast` number, since 399 + 87 + 68 + 7 + 105 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 30279132081 + 9708555024 = 174009^2 + 98532^2 .

It is a de Polignac number, because none of the positive numbers 2^k-39987687105 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444307590 + ... + 444307679.

It is an arithmetic number, because the mean of its divisors is an integer number (5775999255).

Almost surely, 2^39987687105 is an apocalyptic number.

It is an amenable number.

39987687105 is a deficient number, since it is larger than the sum of its proper divisors (29324303955).

39987687105 is a wasteful number, since it uses less digits than its factorization.

39987687105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 888615280 (or 888615277 counting only the distinct ones).

The product of its (nonzero) digits is 22861440, while the sum is 63.

The spelling of 39987687105 in words is "thirty-nine billion, nine hundred eighty-seven million, six hundred eighty-seven thousand, one hundred five".