646554 has 16 divisors (see below), whose sum is σ = 1302048. Its totient is φ = 214032.

The previous prime is 646549. The next prime is 646571. The reversal of 646554 is 455646.

It is an unprimeable number.

646554 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 909 + ... + 1455.

It is an arithmetic number, because the mean of its divisors is an integer number (81378).

2⁶⁴⁶⁵⁵⁴ is an apocalyptic number.

646554 is an abundant number, since it is smaller than the sum of its proper divisors (655494).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

646554 is a wasteful number, since it uses less digits than its factorization.

646554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749.

The product of its digits is 14400, while the sum is 30.

The square root of 646554 is about 804.0858163156. The cubic root of 646554 is about 86.4705592169.

The spelling of 646554 in words is "six hundred forty-six thousand, five hundred fifty-four".