55213620 has 384 divisors, whose sum is σ = 220631040. Its totient is φ = 9953280.

The previous prime is 55213619. The next prime is 55213621. The reversal of 55213620 is 2631255.

55213620 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (55213619) and next prime (55213621).

55213620 is strictly pandigital in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55213621) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1492242 + ... + 1492278.

It is an arithmetic number, because the mean of its divisors is an integer number (574560).

Almost surely, 2^55213620 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 55213620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110315520).

55213620 is an abundant number, since it is smaller than the sum of its proper divisors (165417420).

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

55213620 is a wasteful number, since it uses less digits than its factorization.

55213620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 55213620 is about 7430.5867870579. The cubic root of 55213620 is about 380.7869655903.

Adding to 55213620 its reverse (2631255), we get a palindrome (57844875).

The spelling of 55213620 in words is "fifty-five million, two hundred thirteen thousand, six hundred twenty".