618664 has 16 divisors (see below), whose sum is σ = 1228500. Its totient is φ = 291072.

The previous prime is 618643. The next prime is 618671. The reversal of 618664 is 466816.

It can be written as a sum of positive squares in 2 ways, for example, as 574564 + 44100 = 758^2 + 210^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2139 + ... + 2410.

2⁶¹⁸⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

618664 is a deficient number, since it is larger than the sum of its proper divisors (609836).

618664 is a wasteful number, since it uses less digits than its factorization.

618664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4572 (or 4568 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 618664 is about 786.5519690396. The cubic root of 618664 is about 85.2088979517.

The spelling of 618664 in words is "six hundred eighteen thousand, six hundred sixty-four".