55252420 has 48 divisors (see below), whose sum is σ = 121701888. Its totient is φ = 21047040.

The previous prime is 55252411. The next prime is 55252423. The reversal of 55252420 is 2425255.

It is a happy number.

55252420 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

55252420 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (55252423) 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, 34477 + ... + 36043.

It is an arithmetic number, because the mean of its divisors is an integer number (2535456).

Almost surely, 2^55252420 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55252420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (60850944).

55252420 is an abundant number, since it is smaller than the sum of its proper divisors (66449468).

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

55252420 is a wasteful number, since it uses less digits than its factorization.

55252420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1660 (or 1658 counting only the distinct ones).

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

The square root of 55252420 is about 7433.1971586929. The cubic root of 55252420 is about 380.8761408988.

Adding to 55252420 its reverse (2425255), we get a palindrome (57677675).

The spelling of 55252420 in words is "fifty-five million, two hundred fifty-two thousand, four hundred twenty".