30505725 has 18 divisors (see below), whose sum is σ = 54639546. Its totient is φ = 16269600.

The previous prime is 30505693. The next prime is 30505757. The reversal of 30505725 is 52750503.

It is an interprime number because it is at equal distance from previous prime (30505693) and next prime (30505757).

It can be written as a sum of positive squares in 3 ways, for example, as 1313316 + 29192409 = 1146^2 + 5403^2 .

It is not a de Polignac number, because 30505725 - 2⁵ = 30505693 is a prime.

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 17 ways as a sum of consecutive naturals, for example, 67566 + ... + 68015.

Almost surely, 2^30505725 is an apocalyptic number.

It is an amenable number.

30505725 is a deficient number, since it is larger than the sum of its proper divisors (24133821).

30505725 is a wasteful number, since it uses less digits than its factorization.

30505725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135597 (or 135589 counting only the distinct ones).

The product of its (nonzero) digits is 5250, while the sum is 27.

The square root of 30505725 is about 5523.1988014193. The cubic root of 30505725 is about 312.4595360941.

The spelling of 30505725 in words is "thirty million, five hundred five thousand, seven hundred twenty-five".