216178956 has 60 divisors (see below), whose sum is σ = 645874768. Its totient is φ = 61764768.

The previous prime is 216178939. The next prime is 216178961. The reversal of 216178956 is 659871612.

216178956 is a `hidden beast` number, since 21 + 617 + 8 + 9 + 5 + 6 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 45391 + ... + 49926.

Almost surely, 2^216178956 is an apocalyptic number.

It is an amenable number.

216178956 is an abundant number, since it is smaller than the sum of its proper divisors (429695812).

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

216178956 is a wasteful number, since it uses less digits than its factorization.

216178956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95340 (or 95329 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 216178956 is about 14703.0254029570. The cubic root of 216178956 is about 600.1656542602.

The spelling of 216178956 in words is "two hundred sixteen million, one hundred seventy-eight thousand, nine hundred fifty-six".