615996 has 36 divisors (see below), whose sum is σ = 1585584. Its totient is φ = 201600.

The previous prime is 615971. The next prime is 615997. The reversal of 615996 is 699516.

615996 is a `hidden beast` number, since 61 + 599 + 6 = 666.

615996 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 615996.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (615997) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2436 + ... + 2676.

It is an arithmetic number, because the mean of its divisors is an integer number (44044).

2⁶¹⁵⁹⁹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 615996, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (792792).

615996 is an abundant number, since it is smaller than the sum of its proper divisors (969588).

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

615996 is a wasteful number, since it uses less digits than its factorization.

615996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322 (or 317 counting only the distinct ones).

The product of its digits is 14580, while the sum is 36.

The square root of 615996 is about 784.8541265738. The cubic root of 615996 is about 85.0862331322.

The spelling of 615996 in words is "six hundred fifteen thousand, nine hundred ninety-six".