128447015 has 4 divisors (see below), whose sum is σ = 154136424. Its totient is φ = 102757608.

The previous prime is 128447009. The next prime is 128447027. The reversal of 128447015 is 510744821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128447015 - 2¹⁰ = 128445991 is a prime.

It is a Duffinian number.

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 3 ways as a sum of consecutive naturals, for example, 12844697 + ... + 12844706.

It is an arithmetic number, because the mean of its divisors is an integer number (38534106).

Almost surely, 2^128447015 is an apocalyptic number.

128447015 is a deficient number, since it is larger than the sum of its proper divisors (25689409).

128447015 is an equidigital number, since it uses as much as digits as its factorization.

128447015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25689408.

The product of its (nonzero) digits is 8960, while the sum is 32.

The square root of 128447015 is about 11333.4467396287. The cubic root of 128447015 is about 504.5544087611.

The spelling of 128447015 in words is "one hundred twenty-eight million, four hundred forty-seven thousand, fifteen".