55538620 has 24 divisors (see below), whose sum is σ = 118039824. Its totient is φ = 21947136.

The previous prime is 55538617. The next prime is 55538621. The reversal of 55538620 is 2683555.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55538621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15069 + ... + 18388.

It is an arithmetic number, because the mean of its divisors is an integer number (4918326).

Almost surely, 2^55538620 is an apocalyptic number.

It is an amenable number.

55538620 is an abundant number, since it is smaller than the sum of its proper divisors (62501204).

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

55538620 is a wasteful number, since it uses less digits than its factorization.

55538620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33549 (or 33547 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

The square root of 55538620 is about 7452.4237668023. The cubic root of 55538620 is about 381.5326375006.

The spelling of 55538620 in words is "fifty-five million, five hundred thirty-eight thousand, six hundred twenty".