215320475 has 12 divisors (see below), whose sum is σ = 267248520. Its totient is φ = 172094400.

The previous prime is 215320403. The next prime is 215320477. The reversal of 215320475 is 574023512.

It is a happy number.

It is not a de Polignac number, because 215320475 - 2⁸ = 215320219 is a prime.

It is not an unprimeable number, because it can be changed into a prime (215320477) 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, 28055 + ... + 34895.

It is an arithmetic number, because the mean of its divisors is an integer number (22270710).

Almost surely, 2^215320475 is an apocalyptic number.

215320475 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

215320475 is a deficient number, since it is larger than the sum of its proper divisors (51928045).

215320475 is a wasteful number, since it uses less digits than its factorization.

215320475 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8110 (or 8105 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 29.

The square root of 215320475 is about 14673.8023361363. The cubic root of 215320475 is about 599.3701492299.

Adding to 215320475 its reverse (574023512), we get a palindrome (789343987).

The spelling of 215320475 in words is "two hundred fifteen million, three hundred twenty thousand, four hundred seventy-five".