656470 has 8 divisors (see below), whose sum is σ = 1181664. Its totient is φ = 262584.

The previous prime is 656459. The next prime is 656471. The reversal of 656470 is 74656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656471) by changing a digit.

656470 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 (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32814 + ... + 32833.

It is an arithmetic number, because the mean of its divisors is an integer number (147708).

2⁶⁵⁶⁴⁷⁰ is an apocalyptic number.

656470 is a deficient number, since it is larger than the sum of its proper divisors (525194).

656470 is a wasteful number, since it uses less digits than its factorization.

656470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65654.

The product of its (nonzero) digits is 5040, while the sum is 28.

The square root of 656470 is about 810.2283628706. The cubic root of 656470 is about 86.9103758418.

The spelling of 656470 in words is "six hundred fifty-six thousand, four hundred seventy".