216670788 has 30 divisors (see below), whose sum is σ = 566421086. Its totient is φ = 72223488.

The previous prime is 216670781. The next prime is 216670793. The reversal of 216670788 is 887076612.

It can be written as a sum of positive squares in only one way, i.e., 163788804 + 52881984 = 12798^2 + 7272^2 .

It is not an unprimeable number, because it can be changed into a prime (216670781) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 334045 + ... + 334692.

Almost surely, 2^216670788 is an apocalyptic number.

It is an amenable number.

216670788 is an abundant number, since it is smaller than the sum of its proper divisors (349750298).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216670788 is a wasteful number, since it uses less digits than its factorization.

216670788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 668753 (or 668742 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 216670788 is about 14719.7414379465. The cubic root of 216670788 is about 600.6204581649.

The spelling of 216670788 in words is "two hundred sixteen million, six hundred seventy thousand, seven hundred eighty-eight".