664734 has 64 divisors (see below), whose sum is σ = 1728000. Its totient is φ = 169344.

The previous prime is 664711. The next prime is 664739. The reversal of 664734 is 437466.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

Its product of digits (12096) is a multiple of the sum of its prime divisors (48).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 664734.

It is not an unprimeable number, because it can be changed into a prime (664739) by changing a digit.

664734 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34977 + ... + 34995.

It is an arithmetic number, because the mean of its divisors is an integer number (27000).

2⁶⁶⁴⁷³⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864000).

664734 is an abundant number, since it is smaller than the sum of its proper divisors (1063266).

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

664734 is a wasteful number, since it uses less digits than its factorization.

664734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62 (or 48 counting only the distinct ones).

The product of its digits is 12096, while the sum is 30.

The square root of 664734 is about 815.3122101379. The cubic root of 664734 is about 87.2735477748.

The spelling of 664734 in words is "six hundred sixty-four thousand, seven hundred thirty-four".