1216808290 has 16 divisors (see below), whose sum is σ = 2191400568. Its totient is φ = 486468736.

The previous prime is 1216808287. The next prime is 1216808309. The reversal of 1216808290 is 928086121.

It can be written as a sum of positive squares in 4 ways, for example, as 1127146329 + 89661961 = 33573^2 + 9469^2 .

It is a super-2 number, since 2×1216808290² = 2961244829225448200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11107 + ... + 50566.

Almost surely, 2^1216808290 is an apocalyptic number.

1216808290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1216808290 is a deficient number, since it is larger than the sum of its proper divisors (974592278).

1216808290 is a wasteful number, since it uses less digits than its factorization.

1216808290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63653.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 1216808290 is about 34882.7792757401. The cubic root of 1216808290 is about 1067.5971029813.

The spelling of 1216808290 in words is "one billion, two hundred sixteen million, eight hundred eight thousand, two hundred ninety".