128789715 has 8 divisors (see below), whose sum is σ = 206063568. Its totient is φ = 68687840.

The previous prime is 128789701. The next prime is 128789737. The reversal of 128789715 is 517987821.

It is a happy number.

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

It is not a de Polignac number, because 128789715 - 2⁴ = 128789699 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4292976 + ... + 4293005.

It is an arithmetic number, because the mean of its divisors is an integer number (25757946).

Almost surely, 2^128789715 is an apocalyptic number.

128789715 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128789715 is a deficient number, since it is larger than the sum of its proper divisors (77273853).

128789715 is an equidigital number, since it uses as much as digits as its factorization.

128789715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8585989.

The product of its digits is 282240, while the sum is 48.

The square root of 128789715 is about 11348.5556349696. Note that the first 3 decimals coincide. The cubic root of 128789715 is about 505.0027317435.

The spelling of 128789715 in words is "one hundred twenty-eight million, seven hundred eighty-nine thousand, seven hundred fifteen".