128571965 has 8 divisors (see below), whose sum is σ = 155652408. Its totient is φ = 101946880.

The previous prime is 128571953. The next prime is 128571967. The reversal of 128571965 is 569175821.

It can be written as a sum of positive squares in 4 ways, for example, as 10936249 + 117635716 = 3307^2 + 10846^2 .

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

It is not a de Polignac number, because 128571965 - 2¹⁰ = 128570941 is a prime.

It is a super-2 number, since 2×128571965² = 33061500367922450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128571967) 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 7 ways as a sum of consecutive naturals, for example, 113216 + ... + 114345.

It is an arithmetic number, because the mean of its divisors is an integer number (19456551).

Almost surely, 2^128571965 is an apocalyptic number.

It is an amenable number.

128571965 is a deficient number, since it is larger than the sum of its proper divisors (27080443).

128571965 is a wasteful number, since it uses less digits than its factorization.

128571965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227679.

The product of its digits is 151200, while the sum is 44.

The square root of 128571965 is about 11338.9578445287. The cubic root of 128571965 is about 504.7179616519.

The spelling of 128571965 in words is "one hundred twenty-eight million, five hundred seventy-one thousand, nine hundred sixty-five".