216806277 has 16 divisors (see below), whose sum is σ = 293669888. Its totient is φ = 142248960.

The previous prime is 216806269. The next prime is 216806299. The reversal of 216806277 is 772608612.

216806277 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 216806277 - 2³ = 216806269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216806677) 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, 146652 + ... + 148122.

It is an arithmetic number, because the mean of its divisors is an integer number (18354368).

Almost surely, 2^216806277 is an apocalyptic number.

It is an amenable number.

216806277 is a deficient number, since it is larger than the sum of its proper divisors (76863611).

216806277 is a wasteful number, since it uses less digits than its factorization.

216806277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2220.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 216806277 is about 14724.3430074146. The cubic root of 216806277 is about 600.7456257976.

The spelling of 216806277 in words is "two hundred sixteen million, eight hundred six thousand, two hundred seventy-seven".