128612563 has 4 divisors (see below), whose sum is σ = 128792160. Its totient is φ = 128432968.

The previous prime is 128612543. The next prime is 128612569. The reversal of 128612563 is 365216821.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128612563 is a prime.

It is a super-4 number, since 4×128612563⁴ (a number of 34 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128612569) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88720 + ... + 90157.

It is an arithmetic number, because the mean of its divisors is an integer number (32198040).

Almost surely, 2^128612563 is an apocalyptic number.

128612563 is a deficient number, since it is larger than the sum of its proper divisors (179597).

128612563 is an equidigital number, since it uses as much as digits as its factorization.

128612563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179596.

The product of its digits is 17280, while the sum is 34.

The square root of 128612563 is about 11340.7479030265. The cubic root of 128612563 is about 504.7710794615.

The spelling of 128612563 in words is "one hundred twenty-eight million, six hundred twelve thousand, five hundred sixty-three".