55621300 has 72 divisors (see below), whose sum is σ = 139018880. Its totient is φ = 18921600.

The previous prime is 55621277. The next prime is 55621367. The reversal of 55621300 is 312655.

It is a happy number.

55621300 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126481 + ... + 126919.

Almost surely, 2^55621300 is an apocalyptic number.

55621300 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55621300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69509440).

55621300 is an abundant number, since it is smaller than the sum of its proper divisors (83397580).

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

55621300 is a wasteful number, since it uses less digits than its factorization.

55621300 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641 (or 634 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 55621300 is about 7457.9688923996. The cubic root of 55621300 is about 381.7218720533.

Adding to 55621300 its reverse (312655), we get a palindrome (55933955).

The spelling of 55621300 in words is "fifty-five million, six hundred twenty-one thousand, three hundred".