647611 has 8 divisors (see below), whose sum is σ = 694944. Its totient is φ = 601920.

The previous prime is 647609. The next prime is 647617. The reversal of 647611 is 116746.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 647611 - 2¹ = 647609 is a prime.

It is a Duffinian number.

647611 is a lucky number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 471 + ... + 1231.

It is an arithmetic number, because the mean of its divisors is an integer number (86868).

2⁶⁴⁷⁶¹¹ is an apocalyptic number.

647611 is a deficient number, since it is larger than the sum of its proper divisors (47333).

647611 is a wasteful number, since it uses less digits than its factorization.

647611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821.

The product of its digits is 1008, while the sum is 25.

The square root of 647611 is about 804.7428160599. The cubic root of 647611 is about 86.5176548547.

The spelling of 647611 in words is "six hundred forty-seven thousand, six hundred eleven".