870911985 has 16 divisors (see below), whose sum is σ = 1438410240. Its totient is φ = 449502720.

The previous prime is 870911983. The next prime is 870912017. The reversal of 870911985 is 589119078.

It is not a de Polignac number, because 870911985 - 2¹ = 870911983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (870911983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 936000 + ... + 936929.

It is an arithmetic number, because the mean of its divisors is an integer number (89900640).

Almost surely, 2^870911985 is an apocalyptic number.

It is an amenable number.

870911985 is a deficient number, since it is larger than the sum of its proper divisors (567498255).

870911985 is a wasteful number, since it uses less digits than its factorization.

870911985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1872968.

The product of its (nonzero) digits is 181440, while the sum is 48.

The square root of 870911985 is about 29511.2179518230. The cubic root of 870911985 is about 954.9737244125.

The spelling of 870911985 in words is "eight hundred seventy million, nine hundred eleven thousand, nine hundred eighty-five".