128925515 has 8 divisors (see below), whose sum is σ = 154886640. Its totient is φ = 103023072.

The previous prime is 128925491. The next prime is 128925529. The reversal of 128925515 is 515529821.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128925515 - 2⁶ = 128925451 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9680 + ... + 18749.

It is an arithmetic number, because the mean of its divisors is an integer number (19360830).

Almost surely, 2^128925515 is an apocalyptic number.

128925515 is a deficient number, since it is larger than the sum of its proper divisors (25961125).

128925515 is an equidigital number, since it uses as much as digits as its factorization.

128925515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29341.

The product of its digits is 36000, while the sum is 38.

The square root of 128925515 is about 11354.5371988470. The cubic root of 128925515 is about 505.1801664116.

The spelling of 128925515 in words is "one hundred twenty-eight million, nine hundred twenty-five thousand, five hundred fifteen".