55500030 has 48 divisors (see below), whose sum is σ = 145139904. Its totient is φ = 14713920.

The previous prime is 55499993. The next prime is 55500031. The reversal of 55500030 is 3000555.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55499976 and 55500012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55500031) 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, 14587 + ... + 17993.

It is an arithmetic number, because the mean of its divisors is an integer number (3023748).

Almost surely, 2^55500030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55500030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72569952).

55500030 is an abundant number, since it is smaller than the sum of its proper divisors (89639874).

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

55500030 is a wasteful number, since it uses less digits than its factorization.

55500030 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3601 (or 3598 counting only the distinct ones).

The product of its (nonzero) digits is 375, while the sum is 18.

The square root of 55500030 is about 7449.8342263436. The cubic root of 55500030 is about 381.4442500213. Note that the first 3 decimals are identical.

Adding to 55500030 its reverse (3000555), we get a palindrome (58500585).

The spelling of 55500030 in words is "fifty-five million, five hundred thousand, thirty".