55128625 has 8 divisors (see below), whose sum is σ = 68800680. Its totient is φ = 44102800.

The previous prime is 55128607. The next prime is 55128629. The reversal of 55128625 is 52682155.

It can be written as a sum of positive squares in 4 ways, for example, as 1648656 + 53479969 = 1284^2 + 7313^2 .

It is not a de Polignac number, because 55128625 - 2⁷ = 55128497 is a prime.

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

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 7 ways as a sum of consecutive naturals, for example, 220390 + ... + 220639.

It is an arithmetic number, because the mean of its divisors is an integer number (8600085).

Almost surely, 2^55128625 is an apocalyptic number.

It is an amenable number.

55128625 is a deficient number, since it is larger than the sum of its proper divisors (13672055).

55128625 is an equidigital number, since it uses as much as digits as its factorization.

55128625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441044 (or 441034 counting only the distinct ones).

The product of its digits is 24000, while the sum is 34.

The square root of 55128625 is about 7424.8653186438. The cubic root of 55128625 is about 380.5914727044.

The spelling of 55128625 in words is "fifty-five million, one hundred twenty-eight thousand, six hundred twenty-five".