216780465 has 32 divisors (see below), whose sum is σ = 379209600. Its totient is φ = 104875520.

The previous prime is 216780463. The next prime is 216780467. The reversal of 216780465 is 564087612.

It is an interprime number because it is at equal distance from previous prime (216780463) and next prime (216780467).

It is not a de Polignac number, because 216780465 - 2¹ = 216780463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (216780461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 92731 + ... + 95039.

It is an arithmetic number, because the mean of its divisors is an integer number (11850300).

Almost surely, 2^216780465 is an apocalyptic number.

It is an amenable number.

216780465 is a deficient number, since it is larger than the sum of its proper divisors (162429135).

216780465 is a wasteful number, since it uses less digits than its factorization.

216780465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2897.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 216780465 is about 14723.4664736264. The cubic root of 216780465 is about 600.7217841424.

The spelling of 216780465 in words is "two hundred sixteen million, seven hundred eighty thousand, four hundred sixty-five".