55242520 has 32 divisors (see below), whose sum is σ = 131608800. Its totient is φ = 20796928.

The previous prime is 55242497. The next prime is 55242521. The reversal of 55242520 is 2524255.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55242521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39940 + ... + 41299.

It is an arithmetic number, because the mean of its divisors is an integer number (4112775).

Almost surely, 2^55242520 is an apocalyptic number.

It is an amenable number.

55242520 is an abundant number, since it is smaller than the sum of its proper divisors (76366280).

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

55242520 is a wasteful number, since it uses less digits than its factorization.

55242520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81267 (or 81263 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 55242520 is about 7432.5311973782. The cubic root of 55242520 is about 380.8533913733.

Adding to 55242520 its reverse (2524255), we get a palindrome (57766775).

The spelling of 55242520 in words is "fifty-five million, two hundred forty-two thousand, five hundred twenty".