30111642 has 64 divisors (see below), whose sum is σ = 73681920. Its totient is φ = 9039600.

The previous prime is 30111617. The next prime is 30111643. The reversal of 30111642 is 24611103.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (30111643) 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, 96667 + ... + 96977.

It is an arithmetic number, because the mean of its divisors is an integer number (1151280).

Almost surely, 2^30111642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30111642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36840960).

30111642 is an abundant number, since it is smaller than the sum of its proper divisors (43570278).

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

30111642 is a wasteful number, since it uses less digits than its factorization.

30111642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496 (or 490 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 30111642 is about 5487.4075846432. The cubic root of 30111642 is about 311.1082152886.

Adding to 30111642 its reverse (24611103), we get a palindrome (54722745).

The spelling of 30111642 in words is "thirty million, one hundred eleven thousand, six hundred forty-two".