215078823 has 12 divisors (see below), whose sum is σ = 316531800. Its totient is φ = 140680176.

The previous prime is 215078791. The next prime is 215078827. The reversal of 215078823 is 328870512.

It is not a de Polignac number, because 215078823 - 2⁵ = 215078791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215078827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 224973 + ... + 225926.

It is an arithmetic number, because the mean of its divisors is an integer number (26377650).

Almost surely, 2^215078823 is an apocalyptic number.

215078823 is a deficient number, since it is larger than the sum of its proper divisors (101452977).

215078823 is a wasteful number, since it uses less digits than its factorization.

215078823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450958 (or 450955 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 215078823 is about 14665.5658942981. The cubic root of 215078823 is about 599.1458429365.

The spelling of 215078823 in words is "two hundred fifteen million, seventy-eight thousand, eight hundred twenty-three".