216780355 has 16 divisors (see below), whose sum is σ = 284601600. Its totient is φ = 157204960.

The previous prime is 216780349. The next prime is 216780371. The reversal of 216780355 is 553087612.

It is not a de Polignac number, because 216780355 - 2¹³ = 216772163 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14256 + ... + 25234.

It is an arithmetic number, because the mean of its divisors is an integer number (17787600).

Almost surely, 2^216780355 is an apocalyptic number.

216780355 is a deficient number, since it is larger than the sum of its proper divisors (67821245).

216780355 is a wasteful number, since it uses less digits than its factorization.

216780355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11354.

The product of its (nonzero) digits is 50400, while the sum is 37.

The square root of 216780355 is about 14723.4627380926. The cubic root of 216780355 is about 600.7216825351.

The spelling of 216780355 in words is "two hundred sixteen million, seven hundred eighty thousand, three hundred fifty-five".