646587 has 6 divisors (see below), whose sum is σ = 933972. Its totient is φ = 431052.

The previous prime is 646577. The next prime is 646609. The reversal of 646587 is 785646.

It is a happy number.

646587 is a `hidden beast` number, since 646 + 5 + 8 + 7 = 666.

It is not a de Polignac number, because 646587 - 2⁴ = 646571 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 646587.

It is not an unprimeable number, because it can be changed into a prime (646537) 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, 35913 + ... + 35930.

It is an arithmetic number, because the mean of its divisors is an integer number (155662).

2⁶⁴⁶⁵⁸⁷ is an apocalyptic number.

646587 is a deficient number, since it is larger than the sum of its proper divisors (287385).

646587 is a wasteful number, since it uses less digits than its factorization.

646587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71849 (or 71846 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 646587 is about 804.1063362516. The cubic root of 646587 is about 86.4720303391.

The spelling of 646587 in words is "six hundred forty-six thousand, five hundred eighty-seven".