870870 has 128 divisors (see below), whose sum is σ = 2903040. Its totient is φ = 161280.

The previous prime is 870853. The next prime is 870871. The reversal of 870870 is 78078.

870870 = 66² + 67² + ... + 142².

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870871) by changing a digit.

870870 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 63 ways as a sum of consecutive naturals, for example, 30016 + ... + 30044.

It is an arithmetic number, because the mean of its divisors is an integer number (22680).

2⁸⁷⁰⁸⁷⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 870870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1451520).

870870 is an abundant number, since it is smaller than the sum of its proper divisors (2032170).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

870870 is a wasteful number, since it uses less digits than its factorization.

870870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70.

The product of its (nonzero) digits is 3136, while the sum is 30.

The square root of 870870 is about 933.2041577276. The cubic root of 870870 is about 95.4958378347.

It can be divided in two parts, 8708 and 70, that added together give a palindrome (8778).

The spelling of 870870 in words is "eight hundred seventy thousand, eight hundred seventy".