30681612 has 108 divisors (see below), whose sum is σ = 88286520. Its totient is φ = 9210240.

The previous prime is 30681611. The next prime is 30681619. The reversal of 30681612 is 21618603.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It is a tau number, because it is divible by the number of its divisors (108).

It is a super-2 number, since 2×30681612² = 1882722629837088, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (30681611) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 748312 + ... + 748352.

Almost surely, 2^30681612 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 30681612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44143260).

30681612 is an abundant number, since it is smaller than the sum of its proper divisors (57604908).

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

30681612 is a wasteful number, since it uses less digits than its factorization.

30681612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121 (or 59 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 30681612 is about 5539.0984826053. The cubic root of 30681612 is about 313.0589021084.

Multiplying 30681612 by its sum of digits (27), we get a square (828403524 = 28782²).

30681612 divided by its sum of digits (27) gives a square (1136356 = 1066²).

Multiplying 30681612 by its product of nonzero digits (1728), we get a square (53017825536 = 230256²).

It can be divided in two parts, 306 and 81612, that added together give a palindrome (81918).

The spelling of 30681612 in words is "thirty million, six hundred eighty-one thousand, six hundred twelve".