30120640 has 112 divisors (see below), whose sum is σ = 80467200. Its totient is φ = 10644480.

The previous prime is 30120613. The next prime is 30120667. The reversal of 30120640 is 4602103.

It is an interprime number because it is at equal distance from previous prime (30120613) and next prime (30120667).

It is a Harshad number since it is a multiple of its sum of digits (16).

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, 151261 + ... + 151459.

Almost surely, 2^30120640 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 30120640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40233600).

30120640 is an abundant number, since it is smaller than the sum of its proper divisors (50346560).

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

30120640 is a wasteful number, since it uses less digits than its factorization.

30120640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 260 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 30120640 is about 5488.2274005365. The cubic root of 30120640 is about 311.1392007895.

Adding to 30120640 its reverse (4602103), we get a palindrome (34722743).

The spelling of 30120640 in words is "thirty million, one hundred twenty thousand, six hundred forty".