870427009 has 9 divisors (see below), whose sum is σ = 880665219. Its totient is φ = 860307480.

The previous prime is 870427001. The next prime is 870427037. The reversal of 870427009 is 900724078.

It is a happy number.

The square root of 870427009 is 29503.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 9591409 + 860835600 = 3097^2 + 29340^2 .

It is not a de Polignac number, because 870427009 - 2³ = 870427001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (870427001) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4808899 + ... + 4809079.

It is an arithmetic number, because the mean of its divisors is an integer number (97851691).

Almost surely, 2^870427009 is an apocalyptic number.

870427009 is the 29503-rd square number.

870427009 is the 14752-nd centered octagonal number.

It is an amenable number.

870427009 is a deficient number, since it is larger than the sum of its proper divisors (10238210).

870427009 is an frugal number, since it uses more digits than its factorization.

870427009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 344 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 37.

The cubic root of 870427009 is about 954.7964292937.

Multiplying 870427009 by its product of nonzero digits (28224), we get a square (24566931902016 = 4956504²).

The spelling of 870427009 in words is "eight hundred seventy million, four hundred twenty-seven thousand, nine".