30605240 has 16 divisors (see below), whose sum is σ = 68861880. Its totient is φ = 12242080.

The previous prime is 30605233. The next prime is 30605261. The reversal of 30605240 is 4250603.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 382526 + ... + 382605.

Almost surely, 2^30605240 is an apocalyptic number.

It is an amenable number.

30605240 is an abundant number, since it is smaller than the sum of its proper divisors (38256640).

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

30605240 is a wasteful number, since it uses less digits than its factorization.

30605240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 765142 (or 765138 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 30605240 is about 5532.2002856007. The cubic root of 30605240 is about 312.7989331535.

Adding to 30605240 its reverse (4250603), we get a palindrome (34855843).

The spelling of 30605240 in words is "thirty million, six hundred five thousand, two hundred forty".