216698390 has 16 divisors (see below), whose sum is σ = 395552160. Its totient is φ = 85458240.

The previous prime is 216698329. The next prime is 216698399. The reversal of 216698390 is 93896612.

216698390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216698399) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151895 + ... + 153314.

It is an arithmetic number, because the mean of its divisors is an integer number (24722010).

Almost surely, 2^216698390 is an apocalyptic number.

216698390 is a deficient number, since it is larger than the sum of its proper divisors (178853770).

216698390 is a wasteful number, since it uses less digits than its factorization.

216698390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305287.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 216698390 is about 14720.6789924922. The cubic root of 216698390 is about 600.6459617136.

The spelling of 216698390 in words is "two hundred sixteen million, six hundred ninety-eight thousand, three hundred ninety".