55206840 has 128 divisors (see below), whose sum is σ = 182730240. Its totient is φ = 13257216.

The previous prime is 55206839. The next prime is 55206847. The reversal of 55206840 is 4860255.

55206840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55206798 and 55206807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55206847) 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 31 ways as a sum of consecutive naturals, for example, 66669 + ... + 67491.

It is an arithmetic number, because the mean of its divisors is an integer number (1427580).

Almost surely, 2^55206840 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 55206840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91365120).

55206840 is an abundant number, since it is smaller than the sum of its proper divisors (127523400).

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

55206840 is a wasteful number, since it uses less digits than its factorization.

55206840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 893 (or 889 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 55206840 is about 7430.1305506700. The cubic root of 55206840 is about 380.7713786070.

The spelling of 55206840 in words is "fifty-five million, two hundred six thousand, eight hundred forty".