870904 has 8 divisors (see below), whose sum is σ = 1632960. Its totient is φ = 435448.

The previous prime is 870901. The next prime is 870907. The reversal of 870904 is 409078.

It is an interprime number because it is at equal distance from previous prime (870901) and next prime (870907).

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870901) 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 as a sum of consecutive naturals, namely, 54424 + ... + 54439.

It is an arithmetic number, because the mean of its divisors is an integer number (204120).

2⁸⁷⁰⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

870904 is a deficient number, since it is larger than the sum of its proper divisors (762056).

870904 is a wasteful number, since it uses less digits than its factorization.

870904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108869 (or 108865 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 870904 is about 933.2223743567. Note that the first 3 decimals coincide. The cubic root of 870904 is about 95.4970805829.

The spelling of 870904 in words is "eight hundred seventy thousand, nine hundred four".