664794 has 32 divisors (see below), whose sum is σ = 1592640. Its totient is φ = 204336.

The previous prime is 664793. The next prime is 664799. The reversal of 664794 is 497466.

664794 is a `hidden beast` number, since 6 + 647 + 9 + 4 = 666.

It is not an unprimeable number, because it can be changed into a prime (664793) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 229 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (49770).

2⁶⁶⁴⁷⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664794, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (796320).

664794 is an abundant number, since it is smaller than the sum of its proper divisors (927846).

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

664794 is a wasteful number, since it uses less digits than its factorization.

664794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971 (or 965 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 664794 is about 815.3490050279. The cubic root of 664794 is about 87.2761735145.

The spelling of 664794 in words is "six hundred sixty-four thousand, seven hundred ninety-four".