870890 has 16 divisors (see below), whose sum is σ = 1590408. Its totient is φ = 343296.

The previous prime is 870889. The next prime is 870901. The reversal of 870890 is 98078.

It can be written as a sum of positive squares in 4 ways, for example, as 724201 + 146689 = 851^2 + 383^2 .

It is a fibodiv number, since the Fibonacci-like sequence with seeds 870 and 890 contains 870890 itself.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 870890.

It is an unprimeable 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 7 ways as a sum of consecutive naturals, for example, 134 + ... + 1326.

2⁸⁷⁰⁸⁹⁰ is an apocalyptic number.

870890 is a deficient number, since it is larger than the sum of its proper divisors (719518).

870890 is a wasteful number, since it uses less digits than its factorization.

870890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1273.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 870890 is about 933.2148734348. The cubic root of 870890 is about 95.4965688670.

The spelling of 870890 in words is "eight hundred seventy thousand, eight hundred ninety".