30720275 has 36 divisors (see below), whose sum is σ = 42303096. Its totient is φ = 22041600.

The previous prime is 30720259. The next prime is 30720299. The reversal of 30720275 is 57202703.

It is not a de Polignac number, because 30720275 - 2⁴ = 30720259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 714404 + ... + 714446.

It is an arithmetic number, because the mean of its divisors is an integer number (1175086).

Almost surely, 2^30720275 is an apocalyptic number.

30720275 is a deficient number, since it is larger than the sum of its proper divisors (11582821).

30720275 is a wasteful number, since it uses less digits than its factorization.

30720275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 2940, while the sum is 26.

The square root of 30720275 is about 5542.5873921843. The cubic root of 30720275 is about 313.1903458294.

Adding to 30720275 its reverse (57202703), we get a palindrome (87922978).

The spelling of 30720275 in words is "thirty million, seven hundred twenty thousand, two hundred seventy-five".