125728329 has 4 divisors (see below), whose sum is σ = 167637776. Its totient is φ = 83818884.

The previous prime is 125728321. The next prime is 125728333. The reversal of 125728329 is 923827521.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 923827521 = 3 ⋅307942507.

It is not a de Polignac number, because 125728329 - 2³ = 125728321 is a prime.

It is a super-2 number, since 2×125728329² = 31615225426264482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (125728321) 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 3 ways as a sum of consecutive naturals, for example, 20954719 + ... + 20954724.

It is an arithmetic number, because the mean of its divisors is an integer number (41909444).

Almost surely, 2^125728329 is an apocalyptic number.

It is an amenable number.

125728329 is a deficient number, since it is larger than the sum of its proper divisors (41909447).

125728329 is an equidigital number, since it uses as much as digits as its factorization.

125728329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41909446.

The product of its digits is 60480, while the sum is 39.

The square root of 125728329 is about 11212.8644422378. The cubic root of 125728329 is about 500.9692253239.

The spelling of 125728329 in words is "one hundred twenty-five million, seven hundred twenty-eight thousand, three hundred twenty-nine".