216490785 has 32 divisors (see below), whose sum is σ = 397612800. Its totient is φ = 98531328.

The previous prime is 216490759. The next prime is 216490793. The reversal of 216490785 is 587094612.

216490785 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 216490785 - 2⁵ = 216490753 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20041 + ... + 28889.

It is an arithmetic number, because the mean of its divisors is an integer number (12425400).

Almost surely, 2^216490785 is an apocalyptic number.

It is an amenable number.

216490785 is a deficient number, since it is larger than the sum of its proper divisors (181122015).

216490785 is a wasteful number, since it uses less digits than its factorization.

216490785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9097.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 216490785 is about 14713.6258277829. The cubic root of 216490785 is about 600.4540868108.

The spelling of 216490785 in words is "two hundred sixteen million, four hundred ninety thousand, seven hundred eighty-five".