612128885 has 4 divisors (see below), whose sum is σ = 734554668. Its totient is φ = 489703104.

The previous prime is 612128873. The next prime is 612128887. The reversal of 612128885 is 588821216.

It is a happy number.

612128885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 324792484 + 287336401 = 18022^2 + 16951^2 .

It is a cyclic number.

It is not a de Polignac number, because 612128885 - 2¹⁰ = 612127861 is a prime.

It is a super-3 number, since 3×612128885³ (a number of 27 digits) contains 333 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 (612128887) 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, 61212884 + ... + 61212893.

It is an arithmetic number, because the mean of its divisors is an integer number (183638667).

Almost surely, 2^612128885 is an apocalyptic number.

It is an amenable number.

612128885 is a deficient number, since it is larger than the sum of its proper divisors (122425783).

612128885 is a wasteful number, since it uses less digits than its factorization.

612128885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122425782.

The product of its digits is 61440, while the sum is 41.

The square root of 612128885 is about 24741.2385502424. The cubic root of 612128885 is about 849.0780707738.

The spelling of 612128885 in words is "six hundred twelve million, one hundred twenty-eight thousand, eight hundred eighty-five".