616644 has 36 divisors (see below), whose sum is σ = 1782144. Its totient is φ = 176112.

The previous prime is 616643. The next prime is 616669. The reversal of 616644 is 446616.

616644 is a `hidden beast` number, since 6 + 16 + 644 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (616643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 972 + ... + 1475.

It is an arithmetic number, because the mean of its divisors is an integer number (49504).

2⁶¹⁶⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

616644 is an abundant number, since it is smaller than the sum of its proper divisors (1165500).

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

616644 is a wasteful number, since it uses less digits than its factorization.

616644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464 (or 2459 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 616644 is about 785.2668336305. The cubic root of 616644 is about 85.1160583025.

The spelling of 616644 in words is "six hundred sixteen thousand, six hundred forty-four".