30128128725 has 12 divisors (see below), whose sum is σ = 49811839616. Its totient is φ = 16068335280.

The previous prime is 30128128673. The next prime is 30128128729. The reversal of 30128128725 is 52782182103.

It is not a de Polignac number, because 30128128725 - 2⁸ = 30128128469 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 (30128128729) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 200854117 + ... + 200854266.

Almost surely, 2^30128128725 is an apocalyptic number.

It is an amenable number.

30128128725 is a deficient number, since it is larger than the sum of its proper divisors (19683710891).

30128128725 is a wasteful number, since it uses less digits than its factorization.

30128128725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401708396 (or 401708391 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 39.

The spelling of 30128128725 in words is "thirty billion, one hundred twenty-eight million, one hundred twenty-eight thousand, seven hundred twenty-five".