646654 has 8 divisors (see below), whose sum is σ = 973728. Its totient is φ = 322080.

The previous prime is 646643. The next prime is 646669. The reversal of 646654 is 456646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×646654² = 836322791432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 294 + ... + 1174.

It is an arithmetic number, because the mean of its divisors is an integer number (121716).

2⁶⁴⁶⁶⁵⁴ is an apocalyptic number.

646654 is a deficient number, since it is larger than the sum of its proper divisors (327074).

646654 is a wasteful number, since it uses less digits than its factorization.

646654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250.

The product of its digits is 17280, while the sum is 31.

The square root of 646654 is about 804.1479963290. The cubic root of 646654 is about 86.4750170091.

The spelling of 646654 in words is "six hundred forty-six thousand, six hundred fifty-four".