646733 has 4 divisors (see below), whose sum is σ = 651168. Its totient is φ = 642300.

The previous prime is 646721. The next prime is 646757. The reversal of 646733 is 337646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 646733 - 2⁶ = 646669 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 646696 and 646705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1991 + ... + 2292.

It is an arithmetic number, because the mean of its divisors is an integer number (162792).

2⁶⁴⁶⁷³³ is an apocalyptic number.

It is an amenable number.

646733 is a deficient number, since it is larger than the sum of its proper divisors (4435).

646733 is a wasteful number, since it uses less digits than its factorization.

646733 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434.

The product of its digits is 9072, while the sum is 29.

The square root of 646733 is about 804.1971151403. The cubic root of 646733 is about 86.4785383400.

The spelling of 646733 in words is "six hundred forty-six thousand, seven hundred thirty-three".