646463 has 4 divisors (see below), whose sum is σ = 657480. Its totient is φ = 635448.

The previous prime is 646453. The next prime is 646519. The reversal of 646463 is 364646.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 646463 - 2¹⁶ = 580927 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 (646403) 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, 5420 + ... + 5537.

It is an arithmetic number, because the mean of its divisors is an integer number (164370).

2⁶⁴⁶⁴⁶³ is an apocalyptic number.

646463 is a deficient number, since it is larger than the sum of its proper divisors (11017).

646463 is a wasteful number, since it uses less digits than its factorization.

646463 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11016.

The product of its digits is 10368, while the sum is 29.

The square root of 646463 is about 804.0292283244. The cubic root of 646463 is about 86.4665022265.

The spelling of 646463 in words is "six hundred forty-six thousand, four hundred sixty-three".