869987605 has 8 divisors (see below), whose sum is σ = 1044591192. Its totient is φ = 695586048.

The previous prime is 869987513. The next prime is 869987611. The reversal of 869987605 is 506789968.

It can be written as a sum of positive squares in 4 ways, for example, as 17230801 + 852756804 = 4151^2 + 29202^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 869987605 - 2⁹ = 869987093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 869987605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40864 + ... + 58393.

It is an arithmetic number, because the mean of its divisors is an integer number (130573899).

Almost surely, 2^869987605 is an apocalyptic number.

It is an amenable number.

869987605 is a deficient number, since it is larger than the sum of its proper divisors (174603587).

869987605 is a wasteful number, since it uses less digits than its factorization.

869987605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101015.

The product of its (nonzero) digits is 6531840, while the sum is 58.

The square root of 869987605 is about 29495.5522918287. The cubic root of 869987605 is about 954.6357372876.

The spelling of 869987605 in words is "eight hundred sixty-nine million, nine hundred eighty-seven thousand, six hundred five".