16438827987 has 16 divisors (see below), whose sum is σ = 25635600000. Its totient is φ = 10382417352.

The previous prime is 16438827967. The next prime is 16438827989. The reversal of 16438827987 is 78972883461.

16438827987 is a `hidden beast` number, since 164 + 388 + 2 + 7 + 98 + 7 = 666.

It is not a de Polignac number, because 16438827987 - 2¹⁶ = 16438762451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16438827989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16021737 + ... + 16022762.

It is an arithmetic number, because the mean of its divisors is an integer number (1602225000).

Almost surely, 2^16438827987 is an apocalyptic number.

16438827987 is a deficient number, since it is larger than the sum of its proper divisors (9196772013).

16438827987 is a wasteful number, since it uses less digits than its factorization.

16438827987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32044527 (or 32044521 counting only the distinct ones).

The product of its digits is 32514048, while the sum is 63.

The spelling of 16438827987 in words is "sixteen billion, four hundred thirty-eight million, eight hundred twenty-seven thousand, nine hundred eighty-seven".