641616 has 20 divisors (see below), whose sum is σ = 1657632. Its totient is φ = 213856.

The previous prime is 641581. The next prime is 641623. The reversal of 641616 is 616146.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

641616 is a modest number, since divided by 1616 gives 64 as remainder.

It is a congruent number.

It is an unprimeable number.

641616 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 3 ways as a sum of consecutive naturals, for example, 6636 + ... + 6731.

2⁶⁴¹⁶¹⁶ is an apocalyptic number.

It is an amenable number.

641616 is an abundant number, since it is smaller than the sum of its proper divisors (1016016).

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

641616 is a wasteful number, since it uses less digits than its factorization.

641616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13378 (or 13372 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 641616 is about 801.0093632412. The cubic root of 641616 is about 86.2498592730.

The spelling of 641616 in words is "six hundred forty-one thousand, six hundred sixteen".