55405225 has 12 divisors (see below), whose sum is σ = 71072460. Its totient is φ = 42795200.

The previous prime is 55405223. The next prime is 55405247. The reversal of 55405225 is 52250455.

It can be written as a sum of positive squares in 6 ways, for example, as 9314704 + 46090521 = 3052^2 + 6789^2 .

It is not a de Polignac number, because 55405225 - 2¹ = 55405223 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55405193 and 55405202.

It is not an unprimeable number, because it can be changed into a prime (55405223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37486 + ... + 38935.

It is an arithmetic number, because the mean of its divisors is an integer number (5922705).

Almost surely, 2^55405225 is an apocalyptic number.

It is an amenable number.

55405225 is a deficient number, since it is larger than the sum of its proper divisors (15667235).

55405225 is a wasteful number, since it uses less digits than its factorization.

55405225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76460 (or 76455 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 28.

The square root of 55405225 is about 7443.4686134893. The cubic root of 55405225 is about 381.2269322243.

The spelling of 55405225 in words is "fifty-five million, four hundred five thousand, two hundred twenty-five".