55124420 has 72 divisors (see below), whose sum is σ = 128386944. Its totient is φ = 19863168.

The previous prime is 55124411. The next prime is 55124423. The reversal of 55124420 is 2442155.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (55124423) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 158687 + ... + 159033.

It is an arithmetic number, because the mean of its divisors is an integer number (1783152).

Almost surely, 2^55124420 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 55124420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64193472).

55124420 is an abundant number, since it is smaller than the sum of its proper divisors (73262524).

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

55124420 is a wasteful number, since it uses less digits than its factorization.

55124420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 23.

The square root of 55124420 is about 7424.5821431243. The cubic root of 55124420 is about 380.5817957725.

Adding to 55124420 its reverse (2442155), we get a palindrome (57566575).

The spelling of 55124420 in words is "fifty-five million, one hundred twenty-four thousand, four hundred twenty".