30144640 has 128 divisors (see below), whose sum is σ = 79070400. Its totient is φ = 10948608.

The previous prime is 30144629. The next prime is 30144641. The reversal of 30144640 is 4644103.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is not an unprimeable number, because it can be changed into a prime (30144641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 449887 + ... + 449953.

Almost surely, 2^30144640 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 30144640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39535200).

30144640 is an abundant number, since it is smaller than the sum of its proper divisors (48925760).

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

30144640 is a wasteful number, since it uses less digits than its factorization.

30144640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142 (or 130 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 30144640 is about 5490.4134634834. The cubic root of 30144640 is about 311.2218169887.

Adding to 30144640 its reverse (4644103), we get a palindrome (34788743).

The spelling of 30144640 in words is "thirty million, one hundred forty-four thousand, six hundred forty".