987731859408 has 80 divisors (see below), whose sum is σ = 2916307439616. Its totient is φ = 282194904960.

The previous prime is 987731859407. The next prime is 987731859449. The reversal of 987731859408 is 804958137789.

It is a Cunningham number, because it is equal to 993847²-1.

It is a super-2 number, since 2×987731859408² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987731859407) 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, 7888653 + ... + 8012883.

Almost surely, 2^987731859408 is an apocalyptic number.

It is an amenable number.

987731859408 is an abundant number, since it is smaller than the sum of its proper divisors (1928575580208).

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

987731859408 is a wasteful number, since it uses less digits than its factorization.

987731859408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147912 (or 147906 counting only the distinct ones).

The product of its (nonzero) digits is 121927680, while the sum is 69.

The spelling of 987731859408 in words is "nine hundred eighty-seven billion, seven hundred thirty-one million, eight hundred fifty-nine thousand, four hundred eight".