128473565 has 12 divisors (see below), whose sum is σ = 169458492. Its totient is φ = 93434880.

The previous prime is 128473559. The next prime is 128473589. The reversal of 128473565 is 565374821.

It can be written as a sum of positive squares in 2 ways, for example, as 73994404 + 54479161 = 8602^2 + 7381^2 .

It is not a de Polignac number, because 128473565 - 2⁴ = 128473549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 105572 + ... + 106781.

It is an arithmetic number, because the mean of its divisors is an integer number (14121541).

Almost surely, 2^128473565 is an apocalyptic number.

It is an amenable number.

128473565 is a deficient number, since it is larger than the sum of its proper divisors (40984927).

128473565 is a wasteful number, since it uses less digits than its factorization.

128473565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212380 (or 212369 counting only the distinct ones).

The product of its digits is 201600, while the sum is 41.

The square root of 128473565 is about 11334.6179909161. The cubic root of 128473565 is about 504.5891701675.

The spelling of 128473565 in words is "one hundred twenty-eight million, four hundred seventy-three thousand, five hundred sixty-five".