216280090 has 16 divisors (see below), whose sum is σ = 419250888. Its totient is φ = 79857216.

The previous prime is 216280081. The next prime is 216280139. The reversal of 216280090 is 90082612.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 103856481 + 112423609 = 10191^2 + 10603^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 831717 + ... + 831976.

Almost surely, 2^216280090 is an apocalyptic number.

216280090 is a deficient number, since it is larger than the sum of its proper divisors (202970798).

216280090 is a wasteful number, since it uses less digits than its factorization.

216280090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663713.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 216280090 is about 14706.4642249590. The cubic root of 216280090 is about 600.2592305756.

The spelling of 216280090 in words is "two hundred sixteen million, two hundred eighty thousand, ninety".