55128770 has 8 divisors (see below), whose sum is σ = 99231804. Its totient is φ = 22051504.

The previous prime is 55128763. The next prime is 55128781. The reversal of 55128770 is 7782155.

It can be written as a sum of positive squares in 2 ways, for example, as 54567769 + 561001 = 7387^2 + 749^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 55128770.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2756429 + ... + 2756448.

Almost surely, 2^55128770 is an apocalyptic number.

55128770 is a deficient number, since it is larger than the sum of its proper divisors (44103034).

55128770 is a wasteful number, since it uses less digits than its factorization.

55128770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5512884.

The product of its (nonzero) digits is 19600, while the sum is 35.

The square root of 55128770 is about 7424.8750831243. The cubic root of 55128770 is about 380.5918063829.

The spelling of 55128770 in words is "fifty-five million, one hundred twenty-eight thousand, seven hundred seventy".