216730990 has 16 divisors (see below), whose sum is σ = 445846752. Its totient is φ = 74307744.

The previous prime is 216730973. The next prime is 216730993. The reversal of 216730990 is 99037612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216730993) 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, 1548009 + ... + 1548148.

It is an arithmetic number, because the mean of its divisors is an integer number (27865422).

Almost surely, 2^216730990 is an apocalyptic number.

216730990 is an abundant number, since it is smaller than the sum of its proper divisors (229115762).

216730990 is a wasteful number, since it uses less digits than its factorization.

216730990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3096171.

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 216730990 is about 14721.7862367309. The cubic root of 216730990 is about 600.6760804984.

The spelling of 216730990 in words is "two hundred sixteen million, seven hundred thirty thousand, nine hundred ninety".