30280725 has 18 divisors (see below), whose sum is σ = 54236546. Its totient is φ = 16149600.

The previous prime is 30280721. The next prime is 30280759. The reversal of 30280725 is 52708203.

It can be written as a sum of positive squares in 3 ways, for example, as 8964036 + 21316689 = 2994^2 + 4617^2 .

It is not a de Polignac number, because 30280725 - 2² = 30280721 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30280721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 67066 + ... + 67515.

Almost surely, 2^30280725 is an apocalyptic number.

It is an amenable number.

30280725 is a deficient number, since it is larger than the sum of its proper divisors (23955821).

30280725 is a wasteful number, since it uses less digits than its factorization.

30280725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134597 (or 134589 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 30280725 is about 5502.7924729177. The cubic root of 30280725 is about 311.6894407308.

Adding to 30280725 its reverse (52708203), we get a palindrome (82988928).

The spelling of 30280725 in words is "thirty million, two hundred eighty thousand, seven hundred twenty-five".