55128718 has 8 divisors (see below), whose sum is σ = 82784880. Its totient is φ = 27533760.

The previous prime is 55128679. The next prime is 55128721. The reversal of 55128718 is 81782155.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12978 + ... + 16693.

It is an arithmetic number, because the mean of its divisors is an integer number (10348110).

Almost surely, 2^55128718 is an apocalyptic number.

55128718 is a deficient number, since it is larger than the sum of its proper divisors (27656162).

55128718 is a wasteful number, since it uses less digits than its factorization.

55128718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30602.

The product of its digits is 22400, while the sum is 37.

The square root of 55128718 is about 7424.8715813811. The cubic root of 55128718 is about 380.5916867189.

The spelling of 55128718 in words is "fifty-five million, one hundred twenty-eight thousand, seven hundred eighteen".