30542240 has 24 divisors (see below), whose sum is σ = 72156420. Its totient is φ = 12216832.

The previous prime is 30542207. The next prime is 30542243. The reversal of 30542240 is 4224503.

It can be written as a sum of positive squares in 2 ways, for example, as 25684624 + 4857616 = 5068^2 + 2204^2 .

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

It is not an unprimeable number, because it can be changed into a prime (30542243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95285 + ... + 95604.

Almost surely, 2^30542240 is an apocalyptic number.

It is an amenable number.

30542240 is an abundant number, since it is smaller than the sum of its proper divisors (41614180).

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

30542240 is a wasteful number, since it uses less digits than its factorization.

30542240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190904 (or 190896 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 30542240 is about 5526.5034153613. The cubic root of 30542240 is about 312.5841565345.

Adding to 30542240 its reverse (4224503), we get a palindrome (34766743).

The spelling of 30542240 in words is "thirty million, five hundred forty-two thousand, two hundred forty".