987676765 has 4 divisors (see below), whose sum is σ = 1185212124. Its totient is φ = 790141408.

The previous prime is 987676763. The next prime is 987676769. The reversal of 987676765 is 567676789.

987676765 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 567344761 + 420332004 = 23819^2 + 20502^2 .

It is a cyclic number.

It is not a de Polignac number, because 987676765 - 2¹ = 987676763 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987676763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 98767672 + ... + 98767681.

It is an arithmetic number, because the mean of its divisors is an integer number (296303031).

Almost surely, 2^987676765 is an apocalyptic number.

It is an amenable number.

987676765 is a deficient number, since it is larger than the sum of its proper divisors (197535359).

987676765 is a wasteful number, since it uses less digits than its factorization.

987676765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197535358.

The product of its digits is 26671680, while the sum is 61.

The square root of 987676765 is about 31427.3251327567. The cubic root of 987676765 is about 995.8752649528.

The spelling of 987676765 in words is "nine hundred eighty-seven million, six hundred seventy-six thousand, seven hundred sixty-five".