987856965 has 36 divisors (see below), whose sum is σ = 1778111244. Its totient is φ = 526839552.

The previous prime is 987856921. The next prime is 987856967. The reversal of 987856965 is 569658789.

987856965 is a `hidden beast` number, since 9 + 8 + 7 + 8 + 569 + 65 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 676052001 + 311804964 = 26001^2 + 17658^2 .

It is not a de Polignac number, because 987856965 - 2²⁴ = 971079749 is a prime.

It is a super-2 number, since 2×987856965² = 1951722766598022450, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

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

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17749 + ... + 47861.

It is an arithmetic number, because the mean of its divisors is an integer number (49391979).

Almost surely, 2^987856965 is an apocalyptic number.

It is an amenable number.

987856965 is a deficient number, since it is larger than the sum of its proper divisors (790254279).

987856965 is an frugal number, since it uses more digits than its factorization.

987856965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30142 (or 30121 counting only the distinct ones).

The product of its digits is 32659200, while the sum is 63.

The square root of 987856965 is about 31430.1919338715. The cubic root of 987856965 is about 995.9358265374.

The spelling of 987856965 in words is "nine hundred eighty-seven million, eight hundred fifty-six thousand, nine hundred sixty-five".