615864 has 32 divisors (see below), whose sum is σ = 1566720. Its totient is φ = 201696.

The previous prime is 615833. The next prime is 615869. The reversal of 615864 is 468516.

615864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 615864.

It is not an unprimeable number, because it can be changed into a prime (615869) by changing a digit.

615864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1417 + ... + 1799.

It is an arithmetic number, because the mean of its divisors is an integer number (48960).

2⁶¹⁵⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

615864 is an abundant number, since it is smaller than the sum of its proper divisors (950856).

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

615864 is a wasteful number, since it uses less digits than its factorization.

615864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459 (or 455 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 615864 is about 784.7700300088. The cubic root of 615864 is about 85.0801550705.

The spelling of 615864 in words is "six hundred fifteen thousand, eight hundred sixty-four".