30681288 has 128 divisors (see below), whose sum is σ = 95760000. Its totient is φ = 9020160.

The previous prime is 30681281. The next prime is 30681293. The reversal of 30681288 is 88218603.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (30681281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87738 + ... + 88086.

It is an arithmetic number, because the mean of its divisors is an integer number (748125).

Almost surely, 2^30681288 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 30681288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47880000).

30681288 is an abundant number, since it is smaller than the sum of its proper divisors (65078712).

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

30681288 is a wasteful number, since it uses less digits than its factorization.

30681288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 412 (or 402 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 30681288 is about 5539.0692358915. The cubic root of 30681288 is about 313.0578001298.

30681288 divided by its sum of digits (36) gives a palindrome (852258).

It can be divided in two parts, 3068 and 1288, that added together give a square (4356 = 66²).

The spelling of 30681288 in words is "thirty million, six hundred eighty-one thousand, two hundred eighty-eight".