55813780 has 48 divisors (see below), whose sum is σ = 129991680. Its totient is φ = 19958400.

The previous prime is 55813763. The next prime is 55813783. The reversal of 55813780 is 8731855.

55813780 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55813783) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 11341 + ... + 15499.

It is an arithmetic number, because the mean of its divisors is an integer number (2708160).

Almost surely, 2^55813780 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 55813780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64995840).

55813780 is an abundant number, since it is smaller than the sum of its proper divisors (74177900).

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

55813780 is a wasteful number, since it uses less digits than its factorization.

55813780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4240 (or 4238 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 37.

The square root of 55813780 is about 7470.8620653844. The cubic root of 55813780 is about 382.1616869883.

The spelling of 55813780 in words is "fifty-five million, eight hundred thirteen thousand, seven hundred eighty".