216978 has 24 divisors (see below), whose sum is σ = 459888. Its totient is φ = 68208.

The previous prime is 216973. The next prime is 216991. The reversal of 216978 is 879612.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 216978.

It is not an unprimeable number, because it can be changed into a prime (216973) 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, 5025 + ... + 5067.

It is an arithmetic number, because the mean of its divisors is an integer number (19162).

2²¹⁶⁹⁷⁸ is an apocalyptic number.

216978 is an abundant number, since it is smaller than the sum of its proper divisors (242910).

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

216978 is a wasteful number, since it uses less digits than its factorization.

216978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106 (or 77 counting only the distinct ones).

The product of its digits is 6048, while the sum is 33.

The square root of 216978 is about 465.8089737221. The cubic root of 216978 is about 60.0904192265.

The spelling of 216978 in words is "two hundred sixteen thousand, nine hundred seventy-eight".