55249830 has 64 divisors (see below), whose sum is σ = 156012480. Its totient is φ = 13865472.

The previous prime is 55249823. The next prime is 55249861. The reversal of 55249830 is 3894255.

55249830 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 31 ways as a sum of consecutive naturals, for example, 1429 + ... + 10608.

It is an arithmetic number, because the mean of its divisors is an integer number (2437695).

Almost surely, 2^55249830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55249830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78006240).

55249830 is an abundant number, since it is smaller than the sum of its proper divisors (100762650).

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

55249830 is a wasteful number, since it uses less digits than its factorization.

55249830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12070 (or 12064 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 55249830 is about 7433.0229382130. The cubic root of 55249830 is about 380.8701895178.

The spelling of 55249830 in words is "fifty-five million, two hundred forty-nine thousand, eight hundred thirty".