646497 has 12 divisors (see below), whose sum is σ = 966420. Its totient is φ = 415968.

The previous prime is 646453. The next prime is 646519. The reversal of 646497 is 794646.

646497 is a `hidden beast` number, since 6 + 4 + 649 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 331776 + 314721 = 576^2 + 561^2 .

It is not a de Polignac number, because 646497 - 2⁶ = 646433 is a prime.

646497 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (646397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 978 + ... + 1499.

It is an arithmetic number, because the mean of its divisors is an integer number (80535).

2⁶⁴⁶⁴⁹⁷ is an apocalyptic number.

It is an amenable number.

646497 is a deficient number, since it is larger than the sum of its proper divisors (319923).

646497 is a wasteful number, since it uses less digits than its factorization.

646497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2512 (or 2509 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 646497 is about 804.0503715564. The cubic root of 646497 is about 86.4680180696.

It can be divided in two parts, 6464 and 97, that added together give a 8-th power (6561 = 3⁸).

The spelling of 646497 in words is "six hundred forty-six thousand, four hundred ninety-seven".