664477 has 8 divisors (see below), whose sum is σ = 750240. Its totient is φ = 582960.

The previous prime is 664471. The next prime is 664507. The reversal of 664477 is 774466.

664477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664477 is a prime.

It is a Duffinian number.

664477 is a lucky number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664471) 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, 723 + ... + 1360.

It is an arithmetic number, because the mean of its divisors is an integer number (93780).

2⁶⁶⁴⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

664477 is a deficient number, since it is larger than the sum of its proper divisors (85763).

664477 is a wasteful number, since it uses less digits than its factorization.

664477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2123.

The product of its digits is 28224, while the sum is 34.

The square root of 664477 is about 815.1545865663. The cubic root of 664477 is about 87.2622990683.

The spelling of 664477 in words is "six hundred sixty-four thousand, four hundred seventy-seven".