306612216 has 40 divisors (see below), whose sum is σ = 858799920. Its totient is φ = 102203856.

The previous prime is 306612133. The next prime is 306612217. The reversal of 306612216 is 612216603.

306612216 is a `hidden beast` number, since 30 + 6 + 612 + 2 + 16 = 666.

It is a super-2 number, since 2×306612216² = 188022102000861312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 306612216.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306612217) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 235936 + ... + 237231.

It is an arithmetic number, because the mean of its divisors is an integer number (21469998).

Almost surely, 2^306612216 is an apocalyptic number.

306612216 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

306612216 is an abundant number, since it is smaller than the sum of its proper divisors (552187704).

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

306612216 is a wasteful number, since it uses less digits than its factorization.

306612216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473185 (or 473172 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 306612216 is about 17510.3459703114. The cubic root of 306612216 is about 674.3155135358.

Adding to 306612216 its reverse (612216603), we get a palindrome (918828819).

The spelling of 306612216 in words is "three hundred six million, six hundred twelve thousand, two hundred sixteen".