987731912 has 8 divisors (see below), whose sum is σ = 1851997350. Its totient is φ = 493865952.

The previous prime is 987731897. The next prime is 987731917. The reversal of 987731912 is 219137789.

It can be written as a sum of positive squares in only one way, i.e., 717918436 + 269813476 = 26794^2 + 16426^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×987731912² = 1951228659966351488, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (987731917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61733237 + ... + 61733252.

Almost surely, 2^987731912 is an apocalyptic number.

It is an amenable number.

987731912 is a deficient number, since it is larger than the sum of its proper divisors (864265438).

987731912 is a wasteful number, since it uses less digits than its factorization.

987731912 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123466495 (or 123466491 counting only the distinct ones).

The product of its digits is 190512, while the sum is 47.

The square root of 987731912 is about 31428.2024939385. The cubic root of 987731912 is about 995.8937995291.

The spelling of 987731912 in words is "nine hundred eighty-seven million, seven hundred thirty-one thousand, nine hundred twelve".