647616 has 28 divisors (see below), whose sum is σ = 1713992. Its totient is φ = 215808.

The previous prime is 647609. The next prime is 647617. The reversal of 647616 is 616746.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 647616.

It is not an unprimeable number, because it can be changed into a prime (647617) by changing a digit.

647616 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, 1495 + ... + 1878.

It is an arithmetic number, because the mean of its divisors is an integer number (61214).

2⁶⁴⁷⁶¹⁶ is an apocalyptic number.

It is an amenable number.

647616 is an abundant number, since it is smaller than the sum of its proper divisors (1066376).

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

647616 is a wasteful number, since it uses less digits than its factorization.

647616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3388 (or 3378 counting only the distinct ones).

The product of its digits is 6048, while the sum is 30.

The square root of 647616 is about 804.7459226365. The cubic root of 647616 is about 86.5178775126.

The spelling of 647616 in words is "six hundred forty-seven thousand, six hundred sixteen".