646610 has 8 divisors (see below), whose sum is σ = 1163916. Its totient is φ = 258640.

The previous prime is 646609. The next prime is 646619. The reversal of 646610 is 16646.

It can be written as a sum of positive squares in 2 ways, for example, as 546121 + 100489 = 739^2 + 317^2 .

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

It is not an unprimeable number, because it can be changed into a prime (646619) 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, 32321 + ... + 32340.

2⁶⁴⁶⁶¹⁰ is an apocalyptic number.

646610 is a deficient number, since it is larger than the sum of its proper divisors (517306).

646610 is a wasteful number, since it uses less digits than its factorization.

646610 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64668.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 646610 is about 804.1206377155. The cubic root of 646610 is about 86.4730556371.

The spelling of 646610 in words is "six hundred forty-six thousand, six hundred ten".