216678471 has 4 divisors (see below), whose sum is σ = 288904632. Its totient is φ = 144452312.

The previous prime is 216678463. The next prime is 216678479. The reversal of 216678471 is 174876612.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (216678463) and next prime (216678479).

It is a cyclic number.

It is not a de Polignac number, because 216678471 - 2³ = 216678463 is a prime.

It is a super-3 number, since 3×216678471³ (a number of 26 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216678479) 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, 36113076 + ... + 36113081.

It is an arithmetic number, because the mean of its divisors is an integer number (72226158).

Almost surely, 2^216678471 is an apocalyptic number.

216678471 is a deficient number, since it is larger than the sum of its proper divisors (72226161).

216678471 is an equidigital number, since it uses as much as digits as its factorization.

216678471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72226160.

The product of its digits is 112896, while the sum is 42.

The square root of 216678471 is about 14720.0024116846. The cubic root of 216678471 is about 600.6275572798.

The spelling of 216678471 in words is "two hundred sixteen million, six hundred seventy-eight thousand, four hundred seventy-one".