216678825 has 36 divisors (see below), whose sum is σ = 423382128. Its totient is φ = 105055200.

The previous prime is 216678799. The next prime is 216678827. The reversal of 216678825 is 528876612.

It is not a de Polignac number, because 216678825 - 2⁸ = 216678569 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (216678827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 41299 + ... + 46248.

Almost surely, 2^216678825 is an apocalyptic number.

216678825 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

216678825 is a deficient number, since it is larger than the sum of its proper divisors (206703303).

216678825 is a wasteful number, since it uses less digits than its factorization.

216678825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87574 (or 87566 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 216678825 is about 14720.0144361342. The cubic root of 216678825 is about 600.6278843728.

The spelling of 216678825 in words is "two hundred sixteen million, six hundred seventy-eight thousand, eight hundred twenty-five".