216261370 has 16 divisors (see below), whose sum is σ = 419214600. Its totient is φ = 79850304.

The previous prime is 216261361. The next prime is 216261371. The reversal of 216261370 is 73162612.

It can be written as a sum of positive squares in 4 ways, for example, as 121374289 + 94887081 = 11017^2 + 9741^2 .

It is not an unprimeable number, because it can be changed into a prime (216261371) 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 7 ways as a sum of consecutive naturals, for example, 831645 + ... + 831904.

Almost surely, 2^216261370 is an apocalyptic number.

216261370 is a deficient number, since it is larger than the sum of its proper divisors (202953230).

216261370 is a wasteful number, since it uses less digits than its factorization.

216261370 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1663569.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 216261370 is about 14705.8277563692. The cubic root of 216261370 is about 600.2419117107.

The spelling of 216261370 in words is "two hundred sixteen million, two hundred sixty-one thousand, three hundred seventy".