30750025 has 12 divisors (see below), whose sum is σ = 40373532. Its totient is φ = 23152640.

The previous prime is 30750019. The next prime is 30750053. The reversal of 30750025 is 52005703.

It can be written as a sum of positive squares in 6 ways, for example, as 2913849 + 27836176 = 1707^2 + 5276^2 .

It is not a de Polignac number, because 30750025 - 2⁵ = 30749993 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30749978 and 30750005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35752 + ... + 36601.

It is an arithmetic number, because the mean of its divisors is an integer number (3364461).

Almost surely, 2^30750025 is an apocalyptic number.

It is an amenable number.

30750025 is a deficient number, since it is larger than the sum of its proper divisors (9623507).

30750025 is a wasteful number, since it uses less digits than its factorization.

30750025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72380 (or 72375 counting only the distinct ones).

The product of its (nonzero) digits is 1050, while the sum is 22.

The square root of 30750025 is about 5545.2705073783. The cubic root of 30750025 is about 313.2914127057.

Adding to 30750025 its reverse (52005703), we get a palindrome (82755728).

The spelling of 30750025 in words is "thirty million, seven hundred fifty thousand, twenty-five".