55305442 has 4 divisors (see below), whose sum is σ = 82958166. Its totient is φ = 27652720.

The previous prime is 55305431. The next prime is 55305443. The reversal of 55305442 is 24450355.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 54479161 + 826281 = 7381^2 + 909^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 55305442.

It is not an unprimeable number, because it can be changed into a prime (55305443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13826359 + ... + 13826362.

Almost surely, 2^55305442 is an apocalyptic number.

55305442 is a deficient number, since it is larger than the sum of its proper divisors (27652724).

55305442 is a wasteful number, since it uses less digits than its factorization.

55305442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27652723.

The product of its (nonzero) digits is 12000, while the sum is 28.

The square root of 55305442 is about 7436.7628710347. The cubic root of 55305442 is about 380.9979356143.

Adding to 55305442 its reverse (24450355), we get a palindrome (79755797).

The spelling of 55305442 in words is "fifty-five million, three hundred five thousand, four hundred forty-two".