128572847 has 4 divisors (see below), whose sum is σ = 138463080. Its totient is φ = 118682616.

The previous prime is 128572813. The next prime is 128572849. The reversal of 128572847 is 748275821.

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

It is not a de Polignac number, because 128572847 - 2¹⁶ = 128507311 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128572798 and 128572807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128572849) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 4945097 + ... + 4945122.

It is an arithmetic number, because the mean of its divisors is an integer number (34615770).

Almost surely, 2^128572847 is an apocalyptic number.

128572847 is a deficient number, since it is larger than the sum of its proper divisors (9890233).

128572847 is an equidigital number, since it uses as much as digits as its factorization.

128572847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9890232.

The product of its digits is 250880, while the sum is 44.

The square root of 128572847 is about 11338.9967369252. The cubic root of 128572847 is about 504.7191157662.

The spelling of 128572847 in words is "one hundred twenty-eight million, five hundred seventy-two thousand, eight hundred forty-seven".