664090 has 32 divisors (see below), whose sum is σ = 1399680. Its totient is φ = 222144.

The previous prime is 664067. The next prime is 664091. The reversal of 664090 is 90466.

It is not an unprimeable number, because it can be changed into a prime (664091) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 3621 + ... + 3799.

It is an arithmetic number, because the mean of its divisors is an integer number (43740).

2⁶⁶⁴⁰⁹⁰ is an apocalyptic number.

664090 is an abundant number, since it is smaller than the sum of its proper divisors (735590).

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

664090 is a wasteful number, since it uses less digits than its factorization.

664090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 664090 is about 814.9171737054. The cubic root of 664090 is about 87.2453548811.

The spelling of 664090 in words is "six hundred sixty-four thousand, ninety".