55305240 has 64 divisors (see below), whose sum is σ = 171279360. Its totient is φ = 14271360.

The previous prime is 55305227. The next prime is 55305241. The reversal of 55305240 is 4250355.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 55305240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55305241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3714 + ... + 11153.

It is an arithmetic number, because the mean of its divisors is an integer number (2676240).

Almost surely, 2^55305240 is an apocalyptic number.

It is an amenable number.

55305240 is an abundant number, since it is smaller than the sum of its proper divisors (115974120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55305240 is a wasteful number, since it uses less digits than its factorization.

55305240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14912 (or 14908 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 24.

The square root of 55305240 is about 7436.7492898443. The cubic root of 55305240 is about 380.9974717559.

Adding to 55305240 its reverse (4250355), we get a palindrome (59555595).

The spelling of 55305240 in words is "fifty-five million, three hundred five thousand, two hundred forty".