30661212 has 48 divisors (see below), whose sum is σ = 76204800. Its totient is φ = 9567360.

The previous prime is 30661187. The next prime is 30661237. The reversal of 30661212 is 21216603.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (30661187) and next prime (30661237).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19537 + ... + 21047.

It is an arithmetic number, because the mean of its divisors is an integer number (1587600).

Almost surely, 2^30661212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30661212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38102400).

30661212 is an abundant number, since it is smaller than the sum of its proper divisors (45543588).

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

30661212 is a wasteful number, since it uses less digits than its factorization.

30661212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1626 (or 1624 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 30661212 is about 5537.2567215183. The cubic root of 30661212 is about 312.9895031304.

Adding to 30661212 its reverse (21216603), we get a palindrome (51877815).

It can be divided in two parts, 3066 and 1212, that added together give a triangular number (4278 = T₉₂).

The spelling of 30661212 in words is "thirty million, six hundred sixty-one thousand, two hundred twelve".