870645 has 8 divisors (see below), whose sum is σ = 1393056. Its totient is φ = 464336.

The previous prime is 870643. The next prime is 870679. The reversal of 870645 is 546078.

It is a happy number.

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 870645 - 2¹ = 870643 is a prime.

It is a Curzon number.

870645 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29007 + ... + 29036.

It is an arithmetic number, because the mean of its divisors is an integer number (174132).

2⁸⁷⁰⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

870645 is a deficient number, since it is larger than the sum of its proper divisors (522411).

870645 is a wasteful number, since it uses less digits than its factorization.

870645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58051.

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 870645 is about 933.0835975410. The cubic root of 870645 is about 95.4876129507.

The spelling of 870645 in words is "eight hundred seventy thousand, six hundred forty-five".