664737 has 8 divisors (see below), whose sum is σ = 907104. Its totient is φ = 432768.

The previous prime is 664711. The next prime is 664739. The reversal of 664737 is 737466.

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

It is not a de Polignac number, because 664737 - 2¹⁰ = 663713 is a prime.

664737 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 664698 and 664707.

It is not an unprimeable number, because it can be changed into a prime (664739) 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 7 ways as a sum of consecutive naturals, for example, 2448 + ... + 2705.

It is an arithmetic number, because the mean of its divisors is an integer number (113388).

2⁶⁶⁴⁷³⁷ is an apocalyptic number.

It is an amenable number.

664737 is a deficient number, since it is larger than the sum of its proper divisors (242367).

664737 is a wasteful number, since it uses less digits than its factorization.

664737 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5199.

The product of its digits is 21168, while the sum is 33.

The square root of 664737 is about 815.3140499219. The cubic root of 664737 is about 87.2736790655.

The spelling of 664737 in words is "six hundred sixty-four thousand, seven hundred thirty-seven".