215828 has 12 divisors (see below), whose sum is σ = 383040. Its totient is φ = 106392.

The previous prime is 215827. The next prime is 215833. The reversal of 215828 is 828512.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 215797 and 215806.

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 215828.

It is not an unprimeable number, because it can be changed into a prime (215827) 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, 26 + ... + 657.

It is an arithmetic number, because the mean of its divisors is an integer number (31920).

2²¹⁵⁸²⁸ is an apocalyptic number.

It is an amenable number.

215828 is a deficient number, since it is larger than the sum of its proper divisors (167212).

215828 is a wasteful number, since it uses less digits than its factorization.

215828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766 (or 764 counting only the distinct ones).

The product of its digits is 1280, while the sum is 26.

The square root of 215828 is about 464.5729221554. The cubic root of 215828 is about 59.9840698450.

The spelling of 215828 in words is "two hundred fifteen thousand, eight hundred twenty-eight".