615966 has 32 divisors (see below), whose sum is σ = 1360800. Its totient is φ = 184704.

The previous prime is 615949. The next prime is 615971. The reversal of 615966 is 669516.

615966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×615966² = 758828226312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4060 + ... + 4208.

It is an arithmetic number, because the mean of its divisors is an integer number (42525).

2⁶¹⁵⁹⁶⁶ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 615966, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (680400).

615966 is an abundant number, since it is smaller than the sum of its proper divisors (744834).

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

615966 is a wasteful number, since it uses less digits than its factorization.

615966 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220.

The product of its digits is 9720, while the sum is 33.

The square root of 615966 is about 784.8350145094. The cubic root of 615966 is about 85.0848518308.

The spelling of 615966 in words is "six hundred fifteen thousand, nine hundred sixty-six".