216387678 has 32 divisors (see below), whose sum is σ = 467460000. Its totient is φ = 66381696.

The previous prime is 216387673. The next prime is 216387727. The reversal of 216387678 is 876783612.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216387673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23248 + ... + 31196.

It is an arithmetic number, because the mean of its divisors is an integer number (14608125).

Almost surely, 2^216387678 is an apocalyptic number.

216387678 is an abundant number, since it is smaller than the sum of its proper divisors (251072322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216387678 is a wasteful number, since it uses less digits than its factorization.

216387678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8316.

The product of its digits is 677376, while the sum is 48.

The square root of 216387678 is about 14710.1216174442. The cubic root of 216387678 is about 600.3587465699.

The spelling of 216387678 in words is "two hundred sixteen million, three hundred eighty-seven thousand, six hundred seventy-eight".