615668 has 12 divisors (see below), whose sum is σ = 1085700. Its totient is φ = 305472.

The previous prime is 615661. The next prime is 615677. The reversal of 615668 is 866516.

615668 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 357604 + 258064 = 598^2 + 508^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (615661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80 + ... + 1112.

It is an arithmetic number, because the mean of its divisors is an integer number (90475).

2⁶¹⁵⁶⁶⁸ is an apocalyptic number.

It is an amenable number.

615668 is a deficient number, since it is larger than the sum of its proper divisors (470032).

615668 is a wasteful number, since it uses less digits than its factorization.

615668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186 (or 1184 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 615668 is about 784.6451427238. The cubic root of 615668 is about 85.0711284673.

It can be divided in two parts, 61566 and 8, that multiplied together give a triangular number (492528 = T₉₉₂).

The spelling of 615668 in words is "six hundred fifteen thousand, six hundred sixty-eight".