290509216 has 12 divisors (see below), whose sum is σ = 571940082. Its totient is φ = 145254592.

The previous prime is 290509187. The next prime is 290509217. The reversal of 290509216 is 612905092.

It can be written as a sum of positive squares in only one way, i.e., 223203600 + 67305616 = 14940^2 + 8204^2 .

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (290509217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4539175 + ... + 4539238.

Almost surely, 2^290509216 is an apocalyptic number.

It is an amenable number.

290509216 is a deficient number, since it is larger than the sum of its proper divisors (281430866).

290509216 is an equidigital number, since it uses as much as digits as its factorization.

290509216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9078423 (or 9078415 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 290509216 is about 17044.3309050253. The cubic root of 290509216 is about 662.2977883396.

The spelling of 290509216 in words is "two hundred ninety million, five hundred nine thousand, two hundred sixteen".