216638675 has 12 divisors (see below), whose sum is σ = 293053416. Its totient is φ = 157555200.

The previous prime is 216638657. The next prime is 216638677. The reversal of 216638675 is 576836612.

It is not a de Polignac number, because 216638675 - 2⁸ = 216638419 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (216638677) 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, 393614 + ... + 394163.

It is an arithmetic number, because the mean of its divisors is an integer number (24421118).

Almost surely, 2^216638675 is an apocalyptic number.

216638675 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

216638675 is a deficient number, since it is larger than the sum of its proper divisors (76414741).

216638675 is a wasteful number, since it uses less digits than its factorization.

216638675 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 787798 (or 787793 counting only the distinct ones).

The product of its digits is 362880, while the sum is 44.

The square root of 216638675 is about 14718.6505835284. The cubic root of 216638675 is about 600.5907838406.

The spelling of 216638675 in words is "two hundred sixteen million, six hundred thirty-eight thousand, six hundred seventy-five".