664783 has 6 divisors (see below), whose sum is σ = 773376. Its totient is φ = 569772.

The previous prime is 664777. The next prime is 664789. The reversal of 664783 is 387466.

664783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (664777) and next prime (664789).

It is not a de Polignac number, because 664783 - 2⁹ = 664271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664789) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6735 + ... + 6832.

It is an arithmetic number, because the mean of its divisors is an integer number (128896).

2⁶⁶⁴⁷⁸³ is an apocalyptic number.

664783 is a deficient number, since it is larger than the sum of its proper divisors (108593).

664783 is a wasteful number, since it uses less digits than its factorization.

664783 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13581 (or 13574 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 664783 is about 815.3422594224. The cubic root of 664783 is about 87.2756921407.

The spelling of 664783 in words is "six hundred sixty-four thousand, seven hundred eighty-three".