55523840 has 120 divisors (see below), whose sum is σ = 142561188. Its totient is φ = 20725760.

The previous prime is 55523827. The next prime is 55523843. The reversal of 55523840 is 4832555.

It can be written as a sum of positive squares in 2 ways, for example, as 48888064 + 6635776 = 6992^2 + 2576^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 55523797 and 55523806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55523843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1354220 + ... + 1354260.

Almost surely, 2^55523840 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 55523840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71280594).

55523840 is an abundant number, since it is smaller than the sum of its proper divisors (87037348).

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

55523840 is an equidigital number, since it uses as much as digits as its factorization.

55523840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 71 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 32.

The square root of 55523840 is about 7451.4320771245. The cubic root of 55523840 is about 381.4987898665.

The spelling of 55523840 in words is "fifty-five million, five hundred twenty-three thousand, eight hundred forty".