664370 has 16 divisors (see below), whose sum is σ = 1366848. Its totient is φ = 227760.

The previous prime is 664369. The next prime is 664379. The reversal of 664370 is 73466.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (664379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4676 + ... + 4815.

It is an arithmetic number, because the mean of its divisors is an integer number (85428).

2⁶⁶⁴³⁷⁰ is an apocalyptic number.

664370 is an abundant number, since it is smaller than the sum of its proper divisors (702478).

It is a weird number, because it is abundant, but not a pseudoperfect number.

664370 is a wasteful number, since it uses less digits than its factorization.

664370 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9505.

The product of its (nonzero) digits is 3024, while the sum is 26.

The square root of 664370 is about 815.0889522009. The cubic root of 664370 is about 87.2576148996.

It can be divided in two parts, 66 and 4370, that multiplied together give a triangular number (288420 = T₇₅₉).

The spelling of 664370 in words is "six hundred sixty-four thousand, three hundred seventy".