987856964 has 6 divisors (see below), whose sum is σ = 1728749694. Its totient is φ = 493928480.

The previous prime is 987856921. The next prime is 987856967. The reversal of 987856964 is 469658789.

It can be written as a sum of positive squares in only one way, i.e., 960504064 + 27352900 = 30992^2 + 5230^2 .

It is a super-2 number, since 2×987856964² = 1951722762646594592, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 987856897 and 987856906.

It is not an unprimeable number, because it can be changed into a prime (987856967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 123482117 + ... + 123482124.

It is an arithmetic number, because the mean of its divisors is an integer number (288124949).

Almost surely, 2^987856964 is an apocalyptic number.

It is an amenable number.

987856964 is a deficient number, since it is larger than the sum of its proper divisors (740892730).

987856964 is a wasteful number, since it uses less digits than its factorization.

987856964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246964245 (or 246964243 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 62.

The square root of 987856964 is about 31430.1919179632. The cubic root of 987856964 is about 995.9358262013.

The spelling of 987856964 in words is "nine hundred eighty-seven million, eight hundred fifty-six thousand, nine hundred sixty-four".