55128619 has 8 divisors (see below), whose sum is σ = 67850720. Its totient is φ = 43618176.

The previous prime is 55128607. The next prime is 55128629. The reversal of 55128619 is 91682155.

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

It is not a de Polignac number, because 55128619 - 2¹¹ = 55126571 is a prime.

It is a super-2 number, since 2×55128619² = 6078329265694322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55128629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 302814 + ... + 302995.

It is an arithmetic number, because the mean of its divisors is an integer number (8481340).

Almost surely, 2^55128619 is an apocalyptic number.

55128619 is a deficient number, since it is larger than the sum of its proper divisors (12722101).

55128619 is a wasteful number, since it uses less digits than its factorization.

55128619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605829.

The product of its digits is 21600, while the sum is 37.

The square root of 55128619 is about 7424.8649145961. The cubic root of 55128619 is about 380.5914588970.

The spelling of 55128619 in words is "fifty-five million, one hundred twenty-eight thousand, six hundred nineteen".