55531328 has 14 divisors (see below), whose sum is σ = 110195106. Its totient is φ = 27765632.

The previous prime is 55531321. The next prime is 55531351. The reversal of 55531328 is 82313555.

55531328 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 54878464 + 652864 = 7408^2 + 808^2 .

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 = 55531294 and 55531303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55531321) 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 as a sum of consecutive naturals, namely, 433775 + ... + 433902.

It is an arithmetic number, because the mean of its divisors is an integer number (7871079).

Almost surely, 2^55531328 is an apocalyptic number.

It is an amenable number.

55531328 is a deficient number, since it is larger than the sum of its proper divisors (54663778).

55531328 is an equidigital number, since it uses as much as digits as its factorization.

55531328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 867689 (or 867679 counting only the distinct ones).

The product of its digits is 18000, while the sum is 32.

The square root of 55531328 is about 7451.9345139366. The cubic root of 55531328 is about 381.5159388637.

The spelling of 55531328 in words is "fifty-five million, five hundred thirty-one thousand, three hundred twenty-eight".